Auto generate bindings when `libsql-sqlite3` is changed

Whenever there is a change in libsql-sqlite3, we need to generate the sqlite header files and bindings. These commands to be run:

# this updates libsql-ffi and also libsql-sys
cargo xtask build-bundled 
# this updates bindings required for sqlite3-mc
cargo build --features multiple-ciphers

This is a manual step and easy to miss. It happened in #1027 which was fixed later by #1037

We should automate this, as part of the build process. We should also move multiple-ciphers build within build-bundled, so that there is only one command to run