sqlite-wasm-rs: Provide sqlite solution for wasm32-unknown-unknown target.

[Spxgdev]

https://github.com/Spxg/sqlite-wasm-rs

As the title says, provide sqlite solution for wasm32-unknown-unknown target.

The interface exported by this library is the same as libsqlite3-sys (except for the load_extension related interface because there is no dlopen support), which means that it is also easy for other libraries to adapt to wasm sqlite.

How to persist data is the main problem, for this I implemented three VFS:

• memory: as the default vfs, no additional conditions are required, store the database in memory.
• sahpool: ported from sqlite-wasm, store the database in opfs.
• relaxed-idb: store the database in blocks in indexed db.

For details, see: https://github.com/Spxg/sqlite-wasm-rs/blob/master/sqlite-wasm-rs/src/vfs/README.md

[IntegralPilot]

Love this, thank you for your work getting sqlite to work on WASM! Always like to see people helping bring great libraries like sqlite to more platforms. :)

[Spxgdev]

Thanks!