release: add lib/ micromodules to release-please

[overbalance]

Summary

• Add all 10 lib/ independently-published @protobufjs/* packages to release-please manifest mode config
• Seed .release-please-manifest.json with current versions from each package's package.json
• No workflow changes needed — existing command: manifest picks up the new entries

Motivation

The lib/ micromodules have never been tracked by release-please, so fixes merged to master were never published to npm. This has caused multiple issues:

Directly addresses:

• Deployment process didn't publish libs after changes (around v7.5.0 timeframe) #2094 — Deployment process didn't publish libs after changes
• I found that @protobufjs/utf8 on npm or yarn is still the old code version. #1924 — @protobufjs/utf8 on npm is still the old code version
• Using eval triggers security warning in the terminal #2057 — @protobufjs/inquire eval fix merged but never published
• not support eval and new Function()/Function() #1892 — @protobufjs/codegen and @protobufjs/fetch fixes in git but not on npm
• Use of eval is strongly discouraged #1754 — Use of eval is strongly discouraged (@protobufjs/inquire fix never published)

Related release pipeline issues:

• protobufjs and protobufjs-cli are not the latest in npm #2131 — protobufjs and protobufjs-cli are not the latest in npm
• protobufjs-cli 1.2.0 is not the "latest" in npm #2099 — protobufjs-cli 1.2.0 is not the 'latest' in npm
• Is 6.11.4 an official release? #1928 — No changelog / GitHub release for some versions

Unblocks future releases for open PRs that touch lib/:

• Optimize decoding utf8 buffers to strings. #2062 — Optimize decoding utf8 buffers (lib/utf8)
• Make Codegen work when the Function prototype is frozen #1873 — Make Codegen work when Function prototype is frozen (lib/codegen)
• Refactor Inquire so it can resolve modules in Browsers with default CPS #1548 — Refactor Inquire to avoid eval for CSP (lib/inquire)

Test plan

• Both JSON files validate (node -e "require('./release-please-config.json'); require('./.release-please-manifest.json')")
• After merge, verify release-please opens release PRs for lib packages with unpublished changes