[jrandolf]

As discussed in #14914.

LLM summary of the changes

• Config enables CM_IMPLEMENTS whenever the component-model crate feature is on, like the component model itself, and Config::wasm_component_model_implements documents that default instead of calling the feature a work in progress.
• docs/stability-wasm-proposals.md moves implements to the on-by-default table with a footnote on its Fuzzed ❌.
• implements_enabled_by_default checks that a default Engine accepts an implements import. The .wast harness still turns the feature off unless a test asks for it, so implements-disabled.wast still checks the error.

[github-actions]

Label Messager: wasmtime:config

It looks like you are changing Wasmtime's configuration options. Make sure to
complete this check list:

• If you added a new Config method, you wrote extensive documentation for
  it.

  Details

  Our documentation should be of the following form:

  Short, simple summary sentence.
  
  More details. These details can be multiple paragraphs. There should be
  information about not just the method, but its parameters and results as
  well.
  
  Is this method fallible? If so, when can it return an error?
  
  Can this method panic? If so, when does it panic?
  
  # Example
  
  Optional example here.
  

• If you added a new Config method, or modified an existing one, you
  ensured that this configuration is exercised by the fuzz targets.

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• If you are enabling a configuration option by default, make sure that it
  has been fuzzed for at least two weeks before turning it on by default.

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