[wasm][debugger] Improve array visualization (#19424)

* [wasm][debugger][tests] Refactor test support methods

.. which will help in the upcoming changes.

* [wasm][debugger][tests] Add tests for arrays

- These don't include the broken cases which are fixed in the next
commits

* [wasm][debugger][tests] Fix enumerating locals in async method on a

.. struct.

* [wasm][debugger] Support ValueTypes in arrays

- ValueTypes in array elements are not expanded by default. Instead,
they get an object id like `dotnet:array:{arrayObjectId}:{index}`
- And these get expanded on request

* [wasm][debugger] Fix calls to `mono_wasm_add_null_var` from js

- when being called from `library_mono.js`, with a native string like -

    `MONO.mono_wasm_add_null_var ("string");`

.. which when passed to `Module.UTF8ToString (className)`, returns
`null`. So, if the result of that call is null, then use the `className`
argument as-is.

* [wasm][debugger][tests] Add test for local structs in an async method

* [wasm][debugger][tests] Add `TEST_ARGS` and `TEST_FILTER` arguments to

.. control `dotnet test` arguments.

Example use:

`make run-debugger-tests TEST_ARGS="--filter FullyQualifiedName~ArraysTests"`
or
`make run-debugger-tests TEST_FILTER="ArraysTests"`

* [wasm][debugger][tests] Make `label` the last argument, consistently.

* [wasm][debugger] Address review comments

- Return a `Result` response, instead of throwing an exception

* dummy commit to kick the pr

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