'sk test' command upgrades

[ShaneBeee]

Description

This PR aims to enhance the /sk test command:

• Add test script names to tab complete (from the Test script directory):

• Allow using /sk test all to run all of your test scripts:

• Allow running tests for a directory:

• Log results to file (since the result path is required, let's use it):

• Use pretty printing for json output (easier to read than one super long line):
  (This is both for the test command as well as regular test runs)
  BEFORE:

AFTER:

• Fix a unicode character issue in the outputs:
  BEFORE:

AFTER:

• Added some color to the command output (thanks to Sovde's suggestion):

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Target Minecraft Versions: any
Requirements: none
Related Issues: none

[Efnilite]

looks good