Support hoodiUZH config via intdefine

Allow loading the config #7525 which adjusts a couple config values that
so far have not been overridden by any other networks (incl under dev),
to support their research.

Went with a simple {.intdefine.} approach, and tagged everything that is
solely {.intdefine.} to support hoodiUZH as such with a comment.
The extra module is used because we convert from the raw uint64 to a
different internal type but use the same name so cannot be in same mod.

To compile for hoodiUZH:

```
NIMFLAGS="-d:SECONDS_PER_SLOT=6 -d:REORG_MAX_EPOCHS_SINCE_FINALIZATION=8 -d:MAX_REQUEST_BLOCKS=256 -d:EPOCHS_PER_SUBNET_SUBSCRIPTION=64 -d:TTFB_TIMEOUT=10 -d:RESP_TIMEOUT=20 -d:MAXIMUM_GOSSIP_CLOCK_DISPARITY=1000 -d:SUBNETS_PER_NODE=1 -d:REORG_HEAD_WEIGHT_THRESHOLD=10" make -j nimbus_beacon_node
```

Author: etan-status

beacon_chain/spec/datatypes/constants.nim

@@ -7,7 +7,7 @@
 
 {.push raises: [].}
 
-import chronos/timer
+import chronos/timer, ./constants_raw
 
 type
   Slot* = distinct uint64
@@ -24,8 +24,8 @@ const
   NODE_ID_BITS* = 256
 
   # https://github.com/ethereum/consensus-specs/blob/v1.6.0-alpha.0/specs/phase0/p2p-interface.md#configuration
-  EPOCHS_PER_SUBNET_SUBSCRIPTION* = 256'u64
-  SUBNETS_PER_NODE* = 2'u64
+  EPOCHS_PER_SUBNET_SUBSCRIPTION* {.intdefine.}: uint64 = 256'u64  # hoodiUZH
+  SUBNETS_PER_NODE* {.intdefine.}: uint64 = 2'u64  # hoodiUZH
   ATTESTATION_SUBNET_COUNT*: uint64 = 64
   ATTESTATION_SUBNET_EXTRA_BITS* = 0'u64
   ATTESTATION_SUBNET_PREFIX_BITS* = 6'u64 ## \
@@ -64,15 +64,16 @@ const
 
   # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/phase0/fork-choice.md#configuration
   PROPOSER_SCORE_BOOST*: uint64 = 40
-  REORG_HEAD_WEIGHT_THRESHOLD*: uint64 = 20
+  REORG_HEAD_WEIGHT_THRESHOLD* {.intdefine.}: uint64 = 20  # hoodiUZH
   REORG_PARENT_WEIGHT_THRESHOLD*: uint64 = 160
-  REORG_MAX_EPOCHS_SINCE_FINALIZATION* = Epoch(2)
+  REORG_MAX_EPOCHS_SINCE_FINALIZATION* {.intdefine.} =
+    Epoch(REORG_MAX_EPOCHS_SINCE_FINALIZATION)
 
   # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#configuration
-  MAX_REQUEST_BLOCKS* = 1024'u64
-  RESP_TIMEOUT* = 10'u64
+  MAX_REQUEST_BLOCKS* {.intdefine.}: uint64 = 1024'u64  # hoodiUZH
+  RESP_TIMEOUT* {.intdefine.}: uint64 = 10'u64  # hoodiUZH
   ATTESTATION_PROPAGATION_SLOT_RANGE*: uint64 = 32
-  MAXIMUM_GOSSIP_CLOCK_DISPARITY* = 500.millis
+  MAXIMUM_GOSSIP_CLOCK_DISPARITY* = MAXIMUM_GOSSIP_CLOCK_DISPARITY.int64.millis
 
   # https://github.com/ethereum/consensus-specs/blob/v1.5.0-beta.2/specs/phase0/p2p-interface.md#configuration
   MAX_PAYLOAD_SIZE* = 10'u64 * 1024 * 1024 # bytes

beacon_chain/spec/datatypes/constants_raw.nim

@@ -0,0 +1,12 @@
+# beacon_chain
+# Copyright (c) 2025 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+{.push raises: [].}
+
+const
+  MAXIMUM_GOSSIP_CLOCK_DISPARITY* {.intdefine.}: uint64 = 500  # hoodiUZH
+  REORG_MAX_EPOCHS_SINCE_FINALIZATION* {.intdefine.}: uint64 = 2  # hoodiUZH

beacon_chain/spec/presets.nim

@@ -29,7 +29,7 @@ const
 
   # Not used anywhere; only for network preset checking
   EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION: uint64 = 256
-  TTFB_TIMEOUT* = 5'u64
+  TTFB_TIMEOUT* {.intdefine.}: uint64 = 5'u64  # hoodiUZH
   MESSAGE_DOMAIN_INVALID_SNAPPY*: array[4, byte] = [0x00, 0x00, 0x00, 0x00]
   MESSAGE_DOMAIN_VALID_SNAPPY*: array[4, byte] = [0x01, 0x00, 0x00, 0x00]
 
@@ -722,11 +722,26 @@ else:
 
   # createConstantsFromPreset const_preset
 
-const IsMainnetSupported*: bool =
-  const_preset == "mainnet" and SECONDS_PER_SLOT == 12
-
-const IsGnosisSupported*: bool =
-  const_preset == "gnosis" and SECONDS_PER_SLOT == 5
+const
+  ConstantsAreDefault: bool =
+    REORG_MAX_EPOCHS_SINCE_FINALIZATION.uint64 == 2 and
+    MAX_REQUEST_BLOCKS == 1024 and
+    EPOCHS_PER_SUBNET_SUBSCRIPTION == 256 and
+    TTFB_TIMEOUT == 5 and
+    RESP_TIMEOUT == 10 and
+    MAXIMUM_GOSSIP_CLOCK_DISPARITY.milliseconds.uint64 == 500 and
+    SUBNETS_PER_NODE == 2 and
+    REORG_HEAD_WEIGHT_THRESHOLD == 20
+
+  IsMainnetSupported*: bool =
+    const_preset == "mainnet" and
+    ConstantsAreDefault and
+    SECONDS_PER_SLOT == 12
+
+  IsGnosisSupported*: bool =
+    const_preset == "gnosis" and
+    ConstantsAreDefault and
+    SECONDS_PER_SLOT == 5
 
 const
   MIN_SECONDS_PER_SLOT* = 1'u64