Add `weka` option to `DataSource` #1010

Job	Run time
Compatibility	27s
Pydantic V1	19s
ubuntu-latest - python 3.8 - Lint	14s
ubuntu-latest - python 3.8 - Type check	27s
Docker	19s
ubuntu-latest - python 3.8 - Unit tests	59s
ubuntu-latest - python 3.8 - Doc tests	1m 47s
ubuntu-latest - python 3.8 - Doc tests (B)	1m 16s
ubuntu-latest - python 3.8 - Images	48s
ubuntu-latest - python 3.8 - Jobs	22s
ubuntu-latest - python 3.8 - Experiments	38s
ubuntu-latest - python 3.8 - Datasets	56s
ubuntu-latest - python 3.8 - Sweep example	1m 4s
ubuntu-latest - python 3.8 - Build	24s
ubuntu-latest - python 3.8 - Style	18s
ubuntu-latest - python 3.8 - Docs	31s
Release	0s
	10m 49s

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