Add XML reporter and approval tests

[cschreib]

This PR does the following:

• [API] Add SUCCEED(...) (from Catch2).
• [API] Add REGISTER_REPORTER(...) (from Catch2) for registering multiple reporters that can be selected from the command line.
• [Reporter] Add the Catch2 XML reporter for #100.
• [Reporter] Fix Teamcity reporter reporting [!mayfail] and [!shouldfail] as failures.
• [Reporter] Record file/line information for test cases and sections.
• [Reporter] Record fixture class name for "method" test cases.
• [Reporter] Include test filtering criteria in the test_run_started event.
• [Reporter] Expression data is no longer pre-concatenated into a single message when sent to the reporter.
• [Reporter] Improve handling of long outputs in registry::print and all reporters, so that output is much less likely to be truncated.
• [CLI] Unsupported Catch2 command line parameters will now be handled correctly.
• [CLI] Fix #110.
• [CLI] Closes #113 -- note that this is a breaking change for the CLI filtering.
• [CLI] Closes #114 -- note that this adds new events to event::data hence requires updating existing reporter code.
• [CLI] Add support for --out to save report output to a file.
• [internal] Add approval tests for all reporters.
• [internal] Fixed unsafe use of small_vector_span<const T> when not initialized with a valid backing small_vector.
• [internal] Fix small_function compilation error when assigning a member function (or stateful lambda) when the function parameters contain l-value references.
• [internal] Reduce memory usage of mock_framework in tests by ~x3.
• [internal] Allocate large data used in test on the heap to reduce risk of stack overflow.
• [internal] Fixed stack size for tests not set correctly on Windows.
• [internal] Add file_writer.

As a result, the following Catch2 IDE integrations now work with snitch:

• Visual Studio Code + C++ TestMate
• Visual Studio 2022 + Catch2 Test Adapter
• Clion Catch2 configuration (less well tested)

[codecov[bot]]

Codecov Report

Merging #111 (bff879a) into main (600f532) will increase coverage by 0.36%. The diff coverage is 96.19%.

Additional details and impacted files

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