feat: support for personal repos

[Vingian]

Description

So if for any reason components, dependencies or programs are not being updated... users will be able to fork and update themselves easily(like PERSONAL_COMPONENTS=https://github.com/Vingian/Bottles_components/raw/main). The possibility of using a local repository is maintained by simply specifying file://(like PERSONAL_COMPONENTS=file:///home/Vingian/Bottles_components).

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

[mirkobrombin]

Note for me: maintainer's docs needs to be updated once this is merged.

[github-actions]

Pylint result on modfied files:

************* Module bottles.backend.managers.repository
bottles/backend/managers/repository.py:62:4: R1710: Either all return statements in a function should return an expression, or none of them should. (inconsistent-return-statements)
bottles/backend/managers/repository.py:84:8: C0206: Consider iterating with .items() (consider-using-dict-items)
bottles/backend/managers/repository.py:93:8: R1705: Unnecessary "else" after "return", remove the "else" and de-indent the code inside it (no-else-return)
bottles/backend/managers/repository.py:94:19: I1101: Module 'pycurl' has no 'E_OK' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/managers/repository.py:97:19: I1101: Module 'pycurl' has no 'E_ABORTED_BY_CALLBACK' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/managers/repository.py:115:24: I1101: Module 'pycurl' has no 'Curl' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/managers/repository.py:125:27: I1101: Module 'pycurl' has no 'error' member, but source is unavailable. Consider adding this module to extension-pkg-allow-list if you want to perform analysis based on run-time introspection of living objects. (c-extension-no-member)
bottles/backend/managers/repository.py:34:0: R0903: Too few public methods (1/2) (too-few-public-methods)