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Add SkillCatalog and FilesystemSkillProvider for serving skills from a directory #4618

Job	Run time
checks / docs	1m 50s
checks / test (3.13, locked, windows-latest)	1m 32s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 35s
checks / readme-snippets	14s
checks / pre-commit	58s
checks / test (3.11, locked, ubuntu-latest)	1m 29s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 35s
checks / test (3.13, locked, ubuntu-latest)	1m 38s
checks / test (3.12, locked, ubuntu-latest)	1m 43s
checks / test (3.14, locked, ubuntu-latest)	1m 32s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 24s
checks / test (3.14, lowest-direct, windows-latest)	2m 15s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 28s
checks / test (3.11, lowest-direct, windows-latest)	2m 5s
checks / test (3.14, locked, windows-latest)	2m 16s
checks / test (3.11, locked, windows-latest)	2m 37s
checks / test (3.12, lowest-direct, windows-latest)	2m 43s
checks / test (3.15, lowest-direct, windows-latest)	2m 29s
checks / test (3.13, lowest-direct, windows-latest)	2m 23s
checks / test (3.15, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.15, locked, windows-latest)	2m 9s
checks / test (3.12, locked, windows-latest)	2m 37s
checks / test (3.15, locked, ubuntu-latest)	1m 31s
all-green	4s
	41m 26s