revert: use old library for secp256k1 functions

[brice-stacks]

These should eventually switch over to using the Rust-native k256 crate from RustCrypto, but for now, we are reverting this to allow more time to ensure there are no accidental consensus breaking changes.

Replaces #6644 for now.

[aaronb-stacks]

LGTM! Just checked for an exact match of the prior code:

 % git diff -r release/3.2.0.0.2 HEAD stacks-common/Cargo.toml
diff --git a/stacks-common/Cargo.toml b/stacks-common/Cargo.toml
index 8adaa41eee..b9944732c9 100644
--- a/stacks-common/Cargo.toml
+++ b/stacks-common/Cargo.toml
@@ -42,6 +42,10 @@ serde_json = { workspace = true }
 sha3 = { version = "0.10.1", default-features = false }
 slog = { workspace = true }
 slog-term = { version = "2.6.0", default-features = false }
+thiserror = { workspace = true }
+
+# RustCrypto elliptic curve crates
+p256 = { version = "0.13", default-features = false, features = ["std", "serde", "ecdsa"] }
 
 # Optional dependencies
 getrandom = { version = "0.2", default-features = false, optional = true }
% git diff -r release/3.2.0.0.2 HEAD stacks-common/src/util/secp256k1  
% git diff -r release/3.2.0.0.2 HEAD stacks-common/src/util/mod.rs   
diff --git a/stacks-common/src/util/mod.rs b/stacks-common/src/util/mod.rs
index 69e14a4473..25be66f146 100644
--- a/stacks-common/src/util/mod.rs
+++ b/stacks-common/src/util/mod.rs
@@ -27,6 +27,7 @@ pub mod pair;
 pub mod pipe;
 pub mod retry;
 pub mod secp256k1;
+pub mod secp256r1;
 pub mod serde_serializers;
 pub mod uint;
 pub mod vrf;

And it looks good to me!

[codecov]

Codecov Report

❌ Patch coverage is 62.03320% with 183 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.90%. Comparing base (f8d02cd) to head (ebef1e3).
⚠️ Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
stacks-common/src/util/secp256k1/native.rs	61.25%	179 Missing ⚠️
stacks-common/src/util/secp256k1/mod.rs	0.00%	3 Missing ⚠️
stacks-common/src/util/pipe.rs	0.00%	1 Missing ⚠️

❌ Your project status has failed because the head coverage (62.90%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (f8d02cd) and HEAD (ebef1e3). Click for more details.

HEAD has 50 uploads less than BASE

Flag	BASE (f8d02cd)	HEAD (ebef1e3)
	121	71

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #6645       +/-   ##
============================================
- Coverage    74.67%   62.90%   -11.77%     
============================================
  Files          574      575        +1     
  Lines       355039   354908      -131     
============================================
- Hits        265114   223269    -41845     
- Misses       89925   131639    +41714     

Files with missing lines	Coverage Δ
stacks-common/src/types/mod.rs	79.49% <ø> (-2.13%)	⬇️
stacks-signer/src/signerdb.rs	68.03% <100.00%> (-15.83%)	⬇️
stacks-common/src/util/pipe.rs	61.98% <0.00%> (-13.76%)	⬇️
stacks-common/src/util/secp256k1/mod.rs	0.00% <0.00%> (ø)
stacks-common/src/util/secp256k1/native.rs	61.25% <61.25%> (ø)

... and 401 files with indirect coverage changes

---

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[github-actions]

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