[wasm][debugger] Support multidimensional indexing of `object` scheme

[ilonatommy]

In MemberReferenceResolver.cs we are throwing

throw new InvalidOperationException($"Cannot apply indexing with [,] to an object of type '{type}'");

Remove it and fix it for e.g. testcase:

        [Fact]
        public async Task EvaluateObjectIndexingMultidimensional() => await CheckInspectLocalsAtBreakpointSite(
            "DebuggerTests.EvaluateLocalsWithIndexingTests", "EvaluateLocals", 12, "DebuggerTests.EvaluateLocalsWithIndexingTests.EvaluateLocals",
            "window.setTimeout(function() { invoke_static_method ('[debugger-test] DebuggerTests.EvaluateLocalsWithIndexingTests:EvaluateLocals'); })",
            wait_for_event_fn: async (pause_location) =>
           {
               var id = pause_location["callFrames"][0]["callFrameId"].Value<string>();

               await EvaluateOnCallFrameAndCheck(id,
                   ("f[\'a\', \'&\']", TString("a-&"))
                );
           });

public class TestEvaluate
{
    public string this[char key1, char key2] => $"{key1}-{key2}";
}

and similar. Make sure that not only numeric indexes are supported but other schemes (as above: char) as well.

Tagging subscribers to 'arch-wasm': @lewing
See info in area-owners.md if you want to be subscribed.

Issue Details

---

In MemberReferenceResolver.cs we are throwing

throw new InvalidOperationException($"Cannot apply indexing with [,] to an object of type '{type}'");

Remove it and fix it for e.g. testcase:

        [Fact]
        public async Task EvaluateObjectIndexingMultidimensional() => await CheckInspectLocalsAtBreakpointSite(
            "DebuggerTests.EvaluateLocalsWithIndexingTests", "EvaluateLocals", 12, "DebuggerTests.EvaluateLocalsWithIndexingTests.EvaluateLocals",
            "window.setTimeout(function() { invoke_static_method ('[debugger-test] DebuggerTests.EvaluateLocalsWithIndexingTests:EvaluateLocals'); })",
            wait_for_event_fn: async (pause_location) =>
           {
               var id = pause_location["callFrames"][0]["callFrameId"].Value<string>();

               await EvaluateOnCallFrameAndCheck(id,
                   ("f[\'a\', \'&\']", TString("a-&"))
                );
           });

public class TestEvaluate
{
    public string this[char key1, char key2] => $"{key1}-{key2}";
}

and similar. Make sure that not only numeric indexes are supported but other schemes (as above: char) as well.

Author:	ilonatommy
Assignees:	ilonatommy
Labels:	arch-wasm, area-Debugger-mono
Milestone:	8.0.0