Fragment list consolidation for tiledb cloud arrays

[ypatia]

[sc-48774] This PR implements the needed changes on Core side for supporting fragment list cloud consolidation for tiledb:// arrays. In order for this feature to work end-to-end changes are also needed on the REST server side to deserialize the capnp request and call the right method (consolidate_fragments) for actually doing the consolidation.

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TYPE: FEATURE DESC: Fragment list consolidation for tiledb cloud arrays

[ypatia]

@KiterLuc we should discuss before merging this in case we first need to address this one first: https://app.shortcut.com/tiledb-inc/story/52302/increase-number-of-max-fragments-in-tiledb-fragment-list-consolidation

[ypatia]

@KiterLuc this is now ready for merging.