Make typemap dump utility work with current libxamarin-app.so

[grendello]

Update the tools/tmt utility to support the current format of typemaps in libxamarin-app.so

Also, the utility now generates a nicely formatted Markdown report file instead of the
crude text file output previously.

[jonpryor]

@grendello: should we also add a unit test/integration test wherein we use tmt to process a .apk built by the repo? As a way to "require" changes to tmt whenever the typemap format changes? (So that we don't break things in the future?)

[grendello]

@jonpryor not at this time. I plan to remodel the whole thing, create a single library to handle the tasks of extraction+decompression of assemblies, typemap reader and some sort of libxamarin-app.so correctness/sanity checker. When that library exists, it will be much easier to add all kinds of unit tests.

[jonpryor]

While trying to write up a "more thorough" commit message, I tested this PR out, and…either it's not working like I'd expect, or something broke, or…?

% ./dotnet-local.sh build tools/tmt/*.csproj
% ./dotnet-local.sh build -c Release samples/HelloWorld/HelloWorld/HelloWorld.DotNet.csproj
% bin/Debug/bin/tmt samples/HelloWorld/HelloWorld/bin/Release/net9.0-android/*-Signed.apk
samples/HelloWorld/HelloWorld/bin/Release/net9.0-android/com.xamarin.android.helloworld-Signed.apk!lib/arm64-v8a/libxamarin-app.so:
[W] Assembly Mono.Android cannot be found
[W] Assembly HelloWorld.DotNet cannot be found
[W] Assembly HelloLibrary.DotNet cannot be found
# …wat?
  File Type: Xamarin App Release DSO
  Format version: 2
  Map kind: Release
  Map architecture: ARM64
  Managed to Java entries: 56
  Java to Managed entries: 46 (without duplicates)

…

The assemblies can't be found? Which might explain the contents of e.g. typemap-v2-Release-X86_64.md:

Java to Managed

Java type name	Managed type name	Type token ID	Is Generic?	MVID
android/app/Activity	token id: 33554498, Mono.Android	0x02000042 (33554498)	no	295b9b42-2fe4-4f36-af9c-fbc69503ecb6

None of the entries in the "Managed type name" column contain a type name. They're almost all `token id: …`, Mono.Android, with a couple [name unknown], Mono.Android for good measure.

Meanwhile, decompress-assemblies sees them!

% ./dotnet-local.sh build tools/decompress-assemblies/*.csproj
% ./bin/Debug/bin/decompress-assemblies samples/HelloWorld/HelloWorld/bin/Release/net9.0-android/*-Signed.apk
Processing samples/HelloWorld/HelloWorld/bin/Release/net9.0-android/com.xamarin.android.helloworld-Signed.apk!arm64_v8a/System.Private.CoreLib.dll
  uncompressed to: uncompressed-com.xamarin.android.helloworld-Signed/arm64_v8a/System.Private.CoreLib.dll
…
Processing samples/HelloWorld/HelloWorld/bin/Release/net9.0-android/com.xamarin.android.helloworld-Signed.apk!Mono.Android.dll
  uncompressed to: uncompressed-com.xamarin.android.helloworld-Signed/Mono.Android.dll
…

The inability to print the Managed type name means that the output is "useless", in that I still would need to manually read the typemaps.*.ll files to know what the typemaps are.

[jonpryor]

Draft commit message:

Context: 46f10fe0a5196d1187b704cf945214295c09ccd3
Context? 68368189d67c46ddbfed4e90e622f635c4aff11e

`tools/tmt` (46f10fe0) is a utility to print typemap entries contained
within an application.

`tools/tmt` no longer supports dumping typemap entries; it was
possibly broken in 68368189:

	% ./dotnet-local.sh build tools/tmt/*.csproj
	% ./dotnet-local.sh build -c Release samples/HelloWorld/HelloWorld/HelloWorld.DotNet.csproj
	% bin/Debug/bin/tmt samples/HelloWorld/HelloWorld/bin/Release/net9.0-android/*-Signed.apk
	No type maps found in 'samples/HelloWorld/HelloWorld/bin/Release/net9.0-android/com.xamarin.android.helloworld-Signed.apk'

Update the `tools/tmt` utility to support the current format of
typemaps within `libxamarin-app.so`:

	% bin/Debug/bin/tmt samples/HelloWorld/HelloWorld/bin/Release/net9.0-android/*-Signed.apk
	TODO: correct output?
	TODO: where is typemap data located?  Looks like it's in *.raw & *.md.

Also, the utility now generates a nicely formatted Markdown report
file instead of the crude text file output previously.