tarantool / tarantool / 9320

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Implement box.savepoint

Savepoint allows to partialy rollback a transaction. After
savepoint creation a transaction owner can rollback all changes applied
after the savepoint without rolling back the entire transaction.

Multiple savepoints can be created in each transaction. Rollback to
a savepoint cancels changes after the newest savepoint. That is
savepoints are organized in a stack.
Example:

box.begin()
...
box.savepoint() <---------------+
...                             |
box.savepoint() <------------+  |
...                          |  |
box.rollback_to_savepoint() -+  |
...                             |
box.rollback_to_savepoint() ----+
...

Savepoints can be created inside triggers, and can be used to
rollback to a state before a trigger execution.

Closes #2025

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