feat(core): ability to run local nx plugins w/o build step

[AgentEnder]

Current Behavior

Nx plugins are loaded through a combination of require.resolve and require. For this to work for plugins that were created and live as a project in the workspace, that project must be built and available via NODE_PATH (sometimes this is done by symlinking outputs to node_modules).

This complicates the setup for workspace executors, as devs must set up an automated build before the command. This can be done either using targetDependencies or a clever post-install script, but neither is really ideal.

Using target dependencies, you have to set this up for every target name that a custom executor will be used for
Using post-install scripts, or prepare npm scripts, means that the script has to be run after each change.

Expected Behavior

Created nx plugins' functionality is available to the CLI, in the same manner, that an installed plugin would be.

e.g. this should work

nx g @nrwl/nx-plugin:plugin my-plugin --importPath @acme/my-plugin
nx g @nrwl/nx-plugin:generator app --project my-plugin
nx g @acme/my-plugin:app

Related Issue(s)

Fixes #8824
Fixes #3231
Fixes #6926
Fixes #7271
Fixes #7939
Fixes #6712
Fixes #7166
Fixes #5548

[nx-cloud]

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✅ Successfully ran 7 targets

• nx affected --target=build --base=08c6b02e509f6ddcb9159d136f68364354b2f9f0 --head=48d2390ba8e8640cad60c6ef3ac53426ba817840 --parallel=3
• nx affected --target=e2e --base=08c6b02e509f6ddcb9159d136f68364354b2f9f0 --head=48d2390ba8e8640cad60c6ef3ac53426ba817840 --exclude=e2e-detox,e2e-js,e2e-next,e2e-workspace-create,e2e-workspace-integrations,e2e-workspace-core,e2e-react,e2e-web,e2e-angular-extensions,e2e-angular-core,e2e-cli,e2e-nx-plugin,e2e-cypress,e2e-node,e2e-linter,e2e-jest,e2e-a...
• nx affected --target=e2e --base=08c6b02e509f6ddcb9159d136f68364354b2f9f0 --head=48d2390ba8e8640cad60c6ef3ac53426ba817840 --exclude=e2e-storybook,e2e-react-native,e2e-detox --parallel=1
• nx affected --target=lint --base=08c6b02e509f6ddcb9159d136f68364354b2f9f0 --head=48d2390ba8e8640cad60c6ef3ac53426ba817840 --parallel=3
• nx affected --target=test --base=08c6b02e509f6ddcb9159d136f68364354b2f9f0 --head=48d2390ba8e8640cad60c6ef3ac53426ba817840 --parallel=1
• nx build typedoc-theme
• nx run-many --target=build --all --parallel=8 --exclude=docs,nx-dev-data-access-documents,nx-dev-e2e,nx-dev,nx-dev-feature-analytics,nx-dev-feature-conf,nx-dev-feature-doc-viewer,nx-dev-feature-search,nx-dev-feature-storage,nx-dev-feature-versions-and-flavors,nx-dev-ui-commands,nx-dev-ui-common,nx-dev-ui-home,nx-dev-ui-member-card,nx-dev-ui-sponsor...

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