Deprecate `TextDB`, `AttrsDict`, `catalog` in favour of `dbetto` #352

Job	Run time
Calculate and upload test coverage	24s
Build documentation	28s
Test legendmeta with Python (3.9, ubuntu-latest)	24s
Test legendmeta with Python (3.9, macos-13)	41s
Test legendmeta with Python (3.10, ubuntu-latest)	20s
Test legendmeta with Python (3.10, macos-13)	29s
Test legendmeta with Python (3.11, ubuntu-latest)	19s
Test legendmeta with Python (3.11, macos-13)	37s
Test legendmeta with Python (3.12, ubuntu-latest)	21s
Test legendmeta with Python (3.12, macos-13)	32s
	4m 35s

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