Support dependency overrides

[angrybayblade]

Proposed changes

• Updates dependency merge to override dependencies in order of extra dependencies provided by flag > agent > skill > connection > contract > protocol
• Adds support for extra dependencies and dependency overrides on aea install

Fixes

fixes valory-xyz/open-autonomy#1910

Types of changes

What types of changes does your code introduce to agents-aea?
Put an x in the boxes that apply

• Bugfix (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)

Checklist

Put an x in the boxes that apply.

• I have read the CONTRIBUTING doc
• I am making a pull request against the develop branch (left side). Also you should start your branch off our develop.
• Lint and unit tests pass locally with my changes and CI passes too
• I have added tests that prove my fix is effective or that my feature works
• I have checked that code coverage does not decrease.
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

[solarw]

LGTM

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (454807b) 91.97% compared to head (46ade04) 91.98%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #678   +/-   ##
=======================================
  Coverage   91.97%   91.98%           
=======================================
  Files         371      371           
  Lines       29533    29589   +56     
=======================================
+ Hits        27163    27216   +53     
- Misses       2370     2373    +3     

Flag	Coverage Δ
unittests	91.98% <92.50%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
aea/cli/utils/context.py	97.69% <100.00%> (+0.98%)	⬆️
aea/cli/install.py	97.14% <90.00%> (-2.86%)	⬇️
aea/cli/utils/click_utils.py	92.07% <75.00%> (-0.93%)	⬇️
aea/configurations/data_types.py	98.46% <76.92%> (-0.74%)	⬇️

... and 2 files with indirect coverage changes

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