Add support of bulk and SQL to distributed inserts

[donhardman]

Proposal:

We should add logic that will support our own endpoint bulk and will parse it the same way we do for _bulk to make insertion into distributed tables possible.

Also, as discussed before, we should explore the possibility of using our old SQL regex to enable SQL insertions into distributed tables.

Checklist:

^{To be completed by the assignee. Check off tasks that have been completed or are not applicable.}

• Implementation completed
• Tests developed
• Documentation updated
• Documentation reviewed
• Changelog updated
• OpenAPI YAML updated and issue created to rebuild clients

[donhardman]

We should test SQL inserts into distributed tables using the following image: ghcr.io/manticoresoftware/manticoresearch:test-kit-feature-distributed-inserts

It would be beneficial to test functionality with various schema data types, including JSON, integer, float, and others.

[donhardman]

The task about bulk endpoint support was separated to #413

[donhardman]

@PavelShilin89 please implement required tests