Add `weka` option to `DataSource` #1011

Job	Run time
Compatibility	23s
ubuntu-latest - python 3.8 - Lint	17s
Docker	20s
ubuntu-latest - python 3.8 - Type check	21s
Pydantic V1	15s
ubuntu-latest - python 3.8 - Unit tests	1m 1s
ubuntu-latest - python 3.8 - Doc tests	1m 47s
ubuntu-latest - python 3.8 - Doc tests (B)	1m 24s
ubuntu-latest - python 3.8 - Images	50s
ubuntu-latest - python 3.8 - Jobs	23s
ubuntu-latest - python 3.8 - Experiments	36s
ubuntu-latest - python 3.8 - Datasets	1m 0s
ubuntu-latest - python 3.8 - Sweep example	58s
ubuntu-latest - python 3.8 - Build	26s
ubuntu-latest - python 3.8 - Style	22s
ubuntu-latest - python 3.8 - Docs	29s
Release	0s
	10m 52s

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