Add MariaDB support via MySQL trigger source

[mumoshu]

What is the motivation?

MariaDB is a common MySQL-compatible source; users should sync it with the same from mysql workflow.

What does this change do?

• Documents MariaDB as supported (docs/mariadb.md)
• Reuses the existing MySQL trigger source (mysql://, from mysql subcommands)
• Adds MariaDB JSON handling where JSON is stored as LONGTEXT
• Adds MariaDB e2e tests (full, incremental, interleaved snapshot)

What is your testing strategy?

• make test
• MariaDB container tests against mariadb:11 mirror existing MySQL scenarios

Is this related to any issues?

Closes #67

Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

[nickchomey]

I don't know if any of this is useful or relevant, but there's a nuance with mariadb CDC stuff on more recent versions of mariadb. It's described in this issue

conduitio-labs/conduit-connector-mysql#136

I ended up instigating a fix for the popular golang mysql CDC package. Perhaps some useful info there to double check what you have in rust.
go-mysql-org/go-mysql#893

[mumoshu]

@nickchomey Thanks for the input! I think the link you kindly provided is to leverage MariaDB's own binlog.

Unlike the PostgreSQL source, our MySQL/MariaDB source supports only trigger-based mode today, so the natural next step would be to implement binlog-based modes for those. I'll refer to it when tackling it!

[nickchomey]

Oh, I wasn't aware that it was trigger based. Are you able to elaborate a bit on why? I have to figure there's already rust crates for binlog CDC

[mumoshu]

Hey @nickchomey 👋

I got started with the trigger-based solution because it is more widely available than binlog, and I found no reliable crate for reading/decoding binlog.

Anyways, I've added binlog-based MariaDB/MySQL sources that do DBLog-like watermark-based snapshotting and reconciliation using our own binlog reader/decoder via #105. I believe it should now be the go-to option for syncing MySQL/MariaDB to SurrealDB.

I didn't pay much attention to making it reusable outside this project, but hopefully, it is good enough to serve as a reference.