feat: `create_space` lua API and supporting ddl initiator fns

There are some todos left, but I believe they can be addressed in separate mrs:

1. Test test box.space.create in a transaction with rollback - might be worth waiting for the new interface tarantool-module#107 (comment 28443)

Closes #263 (closed)

assigned to @e-ivkov

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• bd80aa50...62decb8b - 7 commits from branch master
• 699db082 - feat: support ddl in CaS
• 958c050a - fix let-else fmt
• 062be100 - review fix: lazily compute ddl_keys only once
• a331b1bb - fix: cas python tests fixed after rebase
• 7ca9110e - fix: pylint
• c60e62f4 - feat: ddl initiator logic

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• cb62e8ff - feat: ddl initiator logic

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• cb62e8ff...9d0e6b33 - 14 commits from branch master
• 6bcb089b - feat: `create_space` lua API

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resolved all threads

marked this merge request as ready

changed title from Draft: feat: ddl initiator logic to {+feat: create_space lua API and supporting+} ddl initiator fns

changed milestone to %Picodata 2023-06

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• bbf5e8d3 - add tests and docs

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• 9f0a714d - feat: `create_space` lua API
• 9c19f561 - add tests and docs

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• ca869728 - fix clippy warning

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• bfc7f899 - bring index retrieval closer to term query

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requested review from @rosik

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• bfc7f899...fc858335 - 5 commits from branch master
• f05f4854 - feat: `create_space` lua API
• 32035510 - add tests and docs
• 908f2291 - fix clippy warning
• 9d486db8 - bring index retrieval closer to term query

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