ci: Add clippy and fmt lints

[weiji14]

Run cargo clippy, and cargo fmt with import sorting, specifically:

cargo clippy --all-targets --all-features
cargo clippy --all-targets --all-features --manifest-path python/Cargo.toml

cargo fmt --all --check -- --config imports_granularity=Module,group_imports=StdExternalCrate
cargo fmt --all --check --manifest-path python/Cargo.toml -- --config imports_granularity=Module,group_imports=StdExternalCrate

Fixes #107.

[weiji14]

Just realized clippy and fmt are already ran here:

async-tiff/.github/workflows/test.yml

Lines 23 to 27 in fac684f

	- name: Cargo fmt
	run: cargo fmt --all -- --check
	- name: "clippy --all"
	run: cargo clippy --all --all-features --tests -- -D warnings

Personally prefer separate lint/test workflows, so will push some commits for that, but lemme know if I should revert to a single Lint + Test workflow.

[weiji14]

Will need to update the required tests before merging.

[kylebarron]

Thanks!