feat(release): add support for version plans

[fahslaj]

This PR adds support for "version plans", which is Nx Release's way of decoupling the release process from git history.

• Create a version plan with nx release plan. Specify version bumps for each project or release group as determined by nx release config, then a conventional commits style message for changelog generation.
• Plan files are contained in .nx/version-plans directory, and will specify any number of release groups or projects to release
• By default, plans are consumed by the changelog command. This can be overridden with the programmatic API.
• Plans can be enabled on a per-release-group basis

Other changes in this PR:

• The changelog renderer is now decoupled from the GitCommit interface. This allows changelog changes to be passed from other sources (like version plans)
• gitAdd will no longer error if passed a file that doesn't exist and isn't tracked in git
• --firstRelease is now an explicit option on each of the release, release version, release changelog, and release publish commands instead of all children of the top level release command (because it's not relevant for the release plan subcommand)

Outstanding tasks for version plans that this PR does NOT cover:

• Add a more friendly indicator within release plan files when using the default release group. In this PR, the indicator will be the default release group placeholder of __default__.
• Make the plan command smarter, such as the ability to opt-in for conventional commit integration to recommend packages for which to plan releases.
• Decouple version plan change messages from conventional commits standard, which will involve significant changes to how grouping messages is done in the changelog renderer.
• Docs & guides for using version plans

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Name	Status	Preview	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	May 15, 2024 10:11pm

[fahslaj]

This PR replaces #23051

[nx-cloud]

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✅ Successfully ran 6 targets

• nx affected --targets=e2e,e2e-ci --base=d581cef194019ba95803436d210c11e5c2324694 --head=e99ae2dd3b2574cf2210be9e27e6bc740c47cd15 --parallel=1
• nx affected --targets=lint,test,build --base=d581cef194019ba95803436d210c11e5c2324694 --head=e99ae2dd3b2574cf2210be9e27e6bc740c47cd15 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=d581cef194019ba95803436d210c11e5c2324694 --head=e99ae2dd3b2574cf2210be9e27e6bc740c47cd15
• nx documentation --no-dte
• nx affected -t e2e-macos-ci --parallel=1 --base=d581cef194019ba95803436d210c11e5c2324694 --head=e99ae2dd3b2574cf2210be9e27e6bc740c47cd15

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