F grpc f mixed write transactions

Summary

Mixed-write transactions: caosdb/customers/lfpb/management#425

Focus

• Most changes are in src/main/java/org/caosdb/server/grpc/EntityTransactionServiceImpl.java and generalize the old behavior (single write transactions to multiple and mixed transactions). It was a goal to preserve the order of the entities in the request and response which is a little annoying when string id's are involved which cannot be parsed to integer. This case is handled separately in failedWriteDueToStringId.
• It was necessary to refactor WriteTransaction.deriveUpdate for update transactions where entities are being used which are inserted in the same transaction. See my comment there: !35 (comment 24884)

Test Environment

caosdb-cppinttest!17 (merged)

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changed target branch from dev to f-grpc-dev

mentioned in merge request caosdb-cpplib!26 (merged)

mentioned in merge request caosdb-cppinttest!17 (merged)

changed the description

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• 6581dc8a - TST: fix unit tests for deriveUpdate

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• 6f5d3c94 - MAINT: clean-up

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• ab08dc9b - BUG: correctly handle string ids

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• 27f8a4eb - DOC: add more doc strings

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added 2 commits

• 3acacfc0 - 1 commit from branch f-grpc-dev
• 27560346 - Merge branch 'f-grpc-dev' into f-grpc-f-mixed-write-transactions

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marked the checklist item All automated tests pass as completed

requested review from @daniel