Enable support for per package assert tagging configuration

[CraigMacomber]

Description

Refactor assert tagger so its relies much less on function side effects and global state.

Make assert functions configuration per package instead of global.

Remove exclusion of test packages: exclude them as needed using config.

Configure tree to tag its "fail" function.

TODO:

• Ensure added config files don't override other settings for other functionality.

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