feat(elixir): compiler diagnostics

[mhanberg]

Introduce the "extension" concept and creates the ElixirExtension, which
provides Elixir compiler diagnostics.

TODO: Correct the column information on the diagnostics. I think there
are some commits on main that fix some of this. But there are Tokenizer
diagnostics that need some massaging as well.

The interface for extensions also needs to to be finalized.

Extension diagram

sequenceDiagram
    NextLS->>ExtensionFoo: start_child
    NextLS->>ExtensionBar: start_child
    NextLS->>NextLS.Runtime: start_child
    NextLS-->>Task.Supervisor: wait for runtime
    loop Until Runtime Ready
      Task.Supervisor->>NextLS.Runtime: ready?
      NextLS.Runtime->>Task.Supervisor: no
    end
    NextLS.Runtime->>Task.Supervisor: yes
    Task.Supervisor-->>NextLS: ready!
    NextLS-->>Task.Supervisor: ask to compile
    Task.Supervisor->>NextLS.Runtime: compile
    par Runtime to ExtensionFoo
      NextLS.Runtime->>ExtensionFoo: broadcast compiler diagnostics
      ExtensionFoo->>DiagnosticCache: put
      ExtensionFoo->>NextLS: publish1
    and Runtime to ExtensionBar
      NextLS.Runtime->>ExtensionBar: broadcast compiler diagnostics
      ExtensionBar->>DiagnosticCache: put
      ExtensionBar->>NextLS: publish2
    end
    NextLS->>Editor: PublishDiagnostics2
    NextLS->>Editor: PublishDiagnostics1

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[mhanberg]

Current dependencies on/for this PR:

• main
  • PR feat(elixir): compiler diagnostics #8 👈

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