chore: Better accommodate non-GNU sed (#10482)

## Description
Always use `sed -i …` vs. `sed -i ''` as appropriate, with a `sedi` function or alias where possible.

### Security Considerations
n/a

### Scaling Considerations
n/a

### Documentation Considerations
n/a

### Testing Considerations
I haven't found a practical way to test this, so it might go stale—but if so, it's only in development/build tooling so it can be fixed again if that happens.

### Upgrade Considerations
n/a

Author: gibson042

MAINTAINERS.md

@@ -95,7 +95,7 @@ For each set of changes to include after the base branch point:
     - If encountering a commit with conflicts that do not have a straightforward resolution, check if picking any prior commit would help resolve the conflicts.
       - Abort the rebase, update the authored `rebase-todo`, and restart the interactive rebase.
       - Avoid authoring manual changes unless absolutely necessary. If authoring changes, keep them as separate commits and indicate them as such on the authored rebase todo (insert either a `pick` instruction with the id of the commit you just authored or an `exec` instruction that makes the modifications and ends with `git commit -m $message`, in either case prefixing with an explanatory `##` comment).
-        - For `exec`, make portable in-place edits with either `ed` or `alias sed-i="sed -i $(sed --help 2>&1 | sed 2q | grep -qe '-i ' && echo "''")"`, e.g. `printf 'H\n/\( *\)foo/ s##\\1// prettier-ignore\\\n&#\nw\n' | ed -s packages/path/to/file'` or `sed-i -E "$(printf 's#( *)foo#\\1// prettier-ignore\\\n&#')" packages/path/to/file`.
+        - For `exec`, make portable in-place edits with either `ed` or `alias sedi="sed -i $(sed --help 2>&1 | sed 2q | grep -qe '-i ' && echo "''")"`, e.g. `printf 'H\n/\( *\)foo/ s##\\1// prettier-ignore\\\n&#\nw\n' | ed -s packages/path/to/file'` or `sedi -E "$(printf 's#( *)foo#\\1// prettier-ignore\\\n&#')" packages/path/to/file`.
       - If a commit is empty, skip it and comment it out in the rebase todo.
     - [ ] Verify that tests pass. In particular:
       - Linting locally can catch incompatibilities in the cherry-pick, often requiring some changes to be reverted or more commits from `master` to be included. In those cases, update the authored `rebase-todo`, and redo the interactive rebase as necessary.

packages/cosmic-proto/scripts/codegen.cjs

@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 /* eslint-env node */
-const { exec, spawnSync } = require('child_process');
+const { exec, execSync, spawnSync } = require('child_process');
 const path = require('path');
 const process = require('process');
 const telescope = require('@cosmology/telescope').default;
@@ -14,11 +14,12 @@ rimraf(outPath);
  * Make the JsonSafe type import compatible with TS verbatimImportSyntax
  *
  * @param {string} directory
+ * @param {boolean} gnuSed
  */
-function fixTypeImport(directory) {
+function fixTypeImport(directory, gnuSed) {
   const fullPath = path.resolve(directory);
   const command = `
-    find ${fullPath} -type f -exec sed -i '' \
+    find ${fullPath} -type f -exec ${gnuSed ? 'sed -i' : 'sed -i ""'} \
     -e 's/import { JsonSafe/import {type JsonSafe/g' \
     -e 's/\\([{,]\\) \\([[:alnum:]_]*SDKType\\)/\\1 type \\2/g' {} +
   `;
@@ -127,7 +128,11 @@ telescope({
     console.log('🔨 code generated by Telescope');
 
     // for all files under codegen/ replace "import { JsonSafe" with "import type { JsonSafe"
-    fixTypeImport('./src/codegen');
+    const gnuSed =
+      execSync(`sed --help 2>&1 | sed 2q | grep -qe '-i ' || printf gnu`, {
+        encoding: 'utf8',
+      }) === 'gnu';
+    fixTypeImport('./src/codegen', gnuSed);
     console.log('🔧 type keyword added');
 
     spawnSync('yarn', ['prettier', '--write', 'src'], {

packages/cosmic-swingset/scripts/single-node.sh

@@ -29,18 +29,7 @@ $DAEMON gentx --name validator $STAKE --keyring-backend="test"
 $DAEMON collect-gentxs
 
 # Silly old Darwin
-case $(sed --help 2>&1 | sed -n 2p) in
-  "usage: sed script"*"[-i extension]"*)
-    sedi() {
-      sed -i '' ${1+"$@"}
-    }
-    ;;
-  *)
-    sedi() {
-      sed -i ${1+"$@"}
-    }
-    ;;
-esac
+alias sedi="sed -i $(sed --help 2>&1 | sed 2q | grep -qe '-i ' && echo "''")"
 
 case $DAEMON in
   ag-chain-cosmos)