Generate test events for successful assertions

[cschreib]

This PR does the following:

• Add test event for all successful assertions, enabled at new verbosity level full, for #86.
• Verbosity now controls which tests events are sent to the reporter, as opposed to only affecting the default reporter.
• Added option SNITCH_DECOMPOSE_SUCCESSFUL_ASSERTIONS to turn on expression decomposition for successful assertions (default is off, as this is costly).
• SKIP_CHECK() had been partially added in a previous PR, but not exposed fully (docs and shorthand macro form). This is now fixed.
• (internal) Add tests for exception macros.
• (internal) Reduce code duplication between test macros.

[codecov[bot]]

Codecov Report

Merging #87 (41ec621) into main (1eebf1d) will increase coverage by 0.47%. The diff coverage is 97.67%.

Additional details and impacted files

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