Adding type hints to be mypy compliant

[sdavtaker]

Description

Describe:

• This pull request add type-hints for mypy to be able to validate the codebase has not typing issues.

The code was tested by running mypy before and after, there is no behavioural change.

Before:

giturlparse/platforms/base.py:22: error: Need type annotation for "DEFAULTS" (hint: "DEFAULTS: dict[<type>, <type>] = ...")  [var-annotated]
giturlparse/platforms/gitlab.py:31: error: Incompatible types in assignment (expression has type "tuple[str, str]", base class "BasePlatform" defined the type as "None")  [assignment]
giturlparse/platforms/github.py:27: error: Incompatible types in assignment (expression has type "tuple[str, str]", base class "BasePlatform" defined the type as "None")  [assignment]
giturlparse/platforms/friendcode.py:5: error: Incompatible types in assignment (expression has type "tuple[str]", base class "BasePlatform" defined the type as "None")  [assignment]
giturlparse/platforms/bitbucket.py:19: error: Incompatible types in assignment (expression has type "tuple[str]", base class "BasePlatform" defined the type as "None")  [assignment]
giturlparse/platforms/assembla.py:5: error: Incompatible types in assignment (expression has type "tuple[str]", base class "BasePlatform" defined the type as "None")  [assignment]
Found 6 errors in 6 files (checked 15 source files)

After

mypy .                                 
Success: no issues found in 15 source files

To be able to run the checks, mypy and types sub for invoke and setuptools are required.

pip install mypy
pip install types-invoke
pip install types-setuptools

Checklist

• Code lint checked via inv lint
• [-] Tests added

No test added since its not adding functionallity.
I was not able to run inv lint, neither precommit. I run into some issues trying to run it, I will open a Issue about it.

I also tried to follow the format specified here for the commit and changes in the changes file but couldn't understand where should I get the from.
If you can guide me a little I can update the PR to adhere to the convention.