emqx/changes/ce/fix-10500.en.md

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Add several fixes, enhancements and features in Mria:
- protect `mria:join/1,2` with a global lock to prevent conflicts between
two nodes trying to join each other simultaneously
[Mria PR](https://github.com/emqx/mria/pull/137)
- implement new function `mria:sync_transaction/4,3,2`, which blocks the caller until
a transaction is imported to the local node (if the local node is a replicant, otherwise,
it behaves exactly the same as `mria:transaction/3,2`)
[Mria PR](https://github.com/emqx/mria/pull/136)
- optimize `mria:running_nodes/0`
[Mria PR](https://github.com/emqx/mria/pull/135)
- optimize `mria:ro_transaction/2` when called on a replicant node
[Mria PR](https://github.com/emqx/mria/pull/134).