Enable mypy checking for dlstbx

[Anthchirp]

This enables a mypy precommit for dlstbx, and fixes a bunch of outstanding type issues.

The following remain:

src/dlstbx/mimas/core.py:48: error: Item "None" of "Optional[MimasDetectorClass]" has no attribute "name"
src/dlstbx/mimas/core.py:72: error: Item "None" of "Optional[MimasDetectorClass]" has no attribute "name"
src/dlstbx/mimas/core.py:496: error: Item "None" of "Optional[Literal[MimasDetectorClass.EIGER]]" has no attribute "name"
src/dlstbx/wrapper/alphafold.py:15: error: Invalid type comment or annotation
src/dlstbx/wrapper/alphafold.py:15: note: Suggestion: use pydantic.constr[...] instead of pydantic.constr(...)
src/dlstbx/wrapper/alphafold.py:16: error: Invalid type comment or annotation
src/dlstbx/wrapper/alphafold.py:16: note: Suggestion: use pydantic.conint[...] instead of pydantic.conint(...)
src/dlstbx/wrapper/alphafold.py:19: error: Invalid type comment or annotation
src/dlstbx/wrapper/alphafold.py:19: note: Suggestion: use pydantic.confloat[...] instead of pydantic.confloat(...)
src/dlstbx/services/trigger.py:781: error: Incompatible types in assignment (expression has type "Tuple[PDBFileOrCode, ...]", variable has type "List[PDBFileOrCode]")
src/dlstbx/services/trigger.py:813: error: Item "None" of "Optional[Path]" has no attribute "with_name"
src/dlstbx/services/trigger.py:814: error: Item "None" of "Optional[Path]" has no attribute "stem"
src/dlstbx/services/trigger.py:814: error: Item "None" of "Optional[Path]" has no attribute "suffix"
src/dlstbx/services/trigger.py:817: error: Argument 1 to "fspath" has incompatible type "Optional[Path]"; expected "PathLike[str]"
src/dlstbx/services/trigger.py:827: error: Argument 1 to "fspath" has incompatible type "Optional[Path]"; expected "PathLike[str]"
src/dlstbx/services/trigger.py:1148: error: Unsupported left operand type for + ("None")
src/dlstbx/services/trigger.py:1148: note: Left operand is of type "Optional[str]"
Found 13 errors in 3 files (checked 221 source files)

Some of them are stuff I don't want to look into (pydantic), others (mimas/trigger.py) are real type inconsistencies where stuff is defined as Optional but then code assumes it will never see None.

[Anthchirp]

While adding Optional is the minimally invasive and technically correct solution it may not be appropriate. One for RG to decide?

[rjgildea]

I've fixed the alphafold wrapper/trigger service issues. Mimas issues should be addressed in #131.