Release v2.3.0 plan

[simondotm]

Plugin will be built against 16.8.1, and require this as a minimum Nx peer dependency.

Roadmap tasks left:

• [x] Update plugin to minimum 16.8.1
• [x] Add pnpm support for functions
• [x] Document the new --projectNameAndRootFormat support
• [x] Document the pnpm support
• [x] Document the package-lock.json and pnpm-lock.yaml support in 16.8.1
• [x] Improve the npm readme
• [x] Update the firebase SDKs
• [x] Update the firebase function template from SDK template
• [x] Update the compatibility matrix
• [x] Check if package.json files in function generator need to have packageManager field set to deploy properly?

[simondotm]

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