docs: extend mesh plugin introductions docs

[vronifuchsberger]

Description

I discovered some gaps in the documentation when writing my own custom mesh plugin - now trying to contribute to the docs in hope to help the next person :-)

This is adding a few points to the plugin introduction docs; points covered are:

• consuming a plugin that is in same codebase and not a individually published package
• linking to envelop plugin lifecycle to show more clearly which other hooks are available
• explain how to update context from within a plugin hook

Type of change

Please delete options that are not relevant.

• documentation update

Screenshots/Sandbox (if appropriate/relevant):

N/A

How Has This Been Tested?

N/A

Checklist:

• I have followed the
  CONTRIBUTING doc and the
  style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas - N/A
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works, and I have added a
  changeset using yarn changeset that bumps the version - N/A
• New and existing unit tests and linter rules pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose
the solution you did and what alternatives you considered, etc...

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