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Add SkillCatalog and FilesystemSkillProvider for serving skills from a directory #4655

Job	Run time
checks / readme-snippets	14s
checks / test (3.15, locked, windows-latest)	2m 9s
checks / pre-commit	1m 2s
checks / docs	1m 23s
checks / test (3.15, locked, ubuntu-latest)	1m 22s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.15, lowest-direct, ubuntu-latest)	1m 25s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 31s
checks / test (3.14, locked, ubuntu-latest)	1m 26s
checks / test (3.11, locked, windows-latest)	1m 59s
checks / test (3.14, locked, windows-latest)	2m 12s
checks / test (3.11, lowest-direct, windows-latest)	1m 50s
checks / test (3.12, locked, ubuntu-latest)	1m 31s
checks / test (3.14, lowest-direct, windows-latest)	1m 59s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.13, locked, windows-latest)	2m 15s
checks / test (3.13, lowest-direct, windows-latest)	2m 47s
checks / test (3.15, lowest-direct, windows-latest)	2m 10s
checks / test (3.13, locked, ubuntu-latest)	1m 35s
checks / test (3.12, locked, windows-latest)	2m 46s
checks / test (3.11, locked, ubuntu-latest)	1m 42s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.12, lowest-direct, windows-latest)	2m 36s
all-green	4s
	39m 39s