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Refactoring: add return types for ObservationBuilder.get(self, handle: int = 0) and ObservationBuilder.get_many(self, handles: Optional[List[int]] = None)

Resolve "Test for Multi-Speed"

Closes #163 and #168

See merge request !194

Merge branch '173-refactoring-type-hints-named-structures-for-observation-builders-and-predictors' into 'master'

Resolve "Refactoring: Type hints/named structures for observation builders and predictors."

See merge request flatland/flatland!195

Resolve "Enhance sparse_rail_generator"

Closes #169

See merge request !190

Merge branch '169-Enhance_sparse_rail_generator' of gitlab.aicrowd.com:flatland/flatland into 163-multispeed-tests-penalties

Merge branch '169-Enhance_sparse_rail_generator' of gitlab.aicrowd.com:flatland/flatland into 163-multispeed-tests-penalties

Merge branch '169-Enhance_sparse_rail_generator' of gitlab.aicrowd.com:flatland/flatland into 163-multispeed-tests-penalties

Merge branch '169-Enhance_sparse_rail_generator' of gitlab.aicrowd.com:flatland/flatland into 163-multispeed-tests-penalties

Merge branch '169-Enhance_sparse_rail_generator' of gitlab.aicrowd.com:flatland/flatland into 163-multispeed-tests-penalties

Merge branch '168-multispeed-penalties' of gitlab.aicrowd.com:flatland/flatland into 169-Enhance_sparse_rail_generator