fix(tests): Add testing feature to mc-db dev dependency

[notlesh]

This PR adds the testing mc-db feature to mc-block-import dev-dependencies. This fixes compilation errors when running tests in that crate.

Solves #293.

Pull Request type

Fix

[notlesh]

This CI failure looks unrelated to this PR:

npm warn exec The following package was not found and will be installed: [email protected]
Checking formatting...
[warn] .github/workflows/release.yml
[warn] Code style issues found in the above file. Run Prettier with --write to fix.
Error: Process completed with exit code 1.

[antiyro]

This CI failure looks unrelated to this PR:

npm warn exec The following package was not found and will be installed: [email protected]
Checking formatting...
[warn] .github/workflows/release.yml
[warn] Code style issues found in the above file. Run Prettier with --write to fix.
Error: Process completed with exit code 1.

It is probalby due to your changelog format, you can run npx prettier -w . to format it automatically or npx @taplo/[email protected] fmt --config ./taplo/taplo.toml for your cargo format

[notlesh]

This CI failure looks unrelated to this PR:

npm warn exec The following package was not found and will be installed: [email protected]
Checking formatting...
[warn] .github/workflows/release.yml
[warn] Code style issues found in the above file. Run Prettier with --write to fix.
Error: Process completed with exit code 1.

It is probalby due to your changelog format, you can run npx prettier -w . to format it automatically or npx @taplo/[email protected] fmt --config ./taplo/taplo.toml for your cargo format

I think it was fixed by rebasing main. By the way, I force pushed a rebase rather than add a merge, let me know if that's taboo around here :)