[FEA] Add feasibility checks for multi seeds APIs

[afender]

We need to assess the execution feasibility of multi-source features based on input parameters.
This is needed to:

• throw an error early on without running out of memory
• choose the output type of traversals (dense predecessors or sparse edge lists)
• decide if it should proceed in-memory or by offloading output

Related to #1465 (not needed for #1487)

[github-actions]

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