Fix: Missing type annotation

[Antonyjin]

Adding type annotation for a better code clarity and safety. This has been done on the migration of pydantic branch, but adding it first because it should not break the code and facilitate the merge of the pydantic PR

Related ClickUp, GitHub or Jira tickets : ALEPH-XXX

Changes

Adding type annotation in the conf.py file for a better clarity and safety.

Due to the change mypy raised those errors because os.makedirs expects a valid path but variables can be None.
changes have been done about the path validation

src/aleph/vm/conf.py:412: error: Argument 1 to "makedirs" has incompatible type "Path | None"; expected "str | bytes | PathLike[str] | PathLike[bytes]"  [arg-type]
src/aleph/vm/conf.py:413: error: Argument 1 to "makedirs" has incompatible type "Path | None"; expected "str | bytes | PathLike[str] | PathLike[bytes]"  [arg-type]
src/aleph/vm/conf.py:414: error: Argument 1 to "makedirs" has incompatible type "Path | None"; expected "str | bytes | PathLike[str] | PathLike[bytes]"  [arg-type]
src/aleph/vm/conf.py:415: error: Argument 1 to "makedirs" has incompatible type "Path | None"; expected "str | bytes | PathLike[str] | PathLike[bytes]"  [arg-type]
src/aleph/vm/conf.py:431: error: Argument 1 to "makedirs" has incompatible type "Path | None"; expected "str | bytes | PathLike[str] | PathLike[bytes]"  [arg-type]
src/aleph/vm/conf.py:433: error: Argument 1 to "makedirs" has incompatible type "Path | None"; expected "str | bytes | PathLike[str] | PathLike[bytes]"  [arg-type]
src/aleph/vm/conf.py:434: error: Argument 1 to "makedirs" has incompatible type "Path | None"; expected "str | bytes | PathLike[str] | PathLike[bytes]"  [arg-type]

[codecov]

Codecov Report

Attention: Patch coverage is 86.44068% with 8 lines in your changes missing coverage. Please review.

Project coverage is 63.26%. Comparing base (1c2c180) to head (41ff093).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aleph/vm/conf.py	86.44%	0 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #773      +/-   ##
==========================================
- Coverage   63.34%   63.26%   -0.08%     
==========================================
  Files          77       77              
  Lines        6848     6855       +7     
  Branches      568      576       +8     
==========================================
- Hits         4338     4337       -1     
  Misses       2329     2329              
- Partials      181      189       +8     

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