For SQL transactions, we often accumulate results in variables declared
outside the closure's scope. To eliminate the need for manually clearing
these containers, we introduce a reset function to ExecTx, mirroring the
approach already adopted in kvdb.
This commit provides the scaffolding for using the new sql stores.
The new interfaces, structs and methods are in sync with other projects
like Taproot Assets.
- Transactional Queries: the sqldb package defines the interfaces required
to execute transactional queries to our storage interface.
- Migration Files Embedded: the migration files are embedded into the binary.
- Database Migrations: I kept the use of 'golang-migrate' to ensure our
codebase remains in sync with the other projects, but can be changed.
- Build Flags for Conditional DB Target: flexibility to specify our database
target at compile-time based on the build flags in the same way we do
with our kv stores.
- Update modules: ran `go mod tidy`.
