Add 'dependencies' field in AEA configuration

[marcofavorito]

Proposed changes

Add dependencies field in AEA configuration.

Fixes

n/a

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
• 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 checked that the documentation about the aea cli tool works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Further comments

n/a

[marcofavorito]

this is currently optional for backward compatibility, but will be made mandatory in the next release.

[marcofavorito]

reason: otherwise many tests that rely on the remote registry would fail (e.g. aea upgrade tests).

[DavidMinarsch]

Yes, please open issue so we don't forget to make it strict later.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (fix/crypto-plugin@8c92aa8). Click here to learn what that means.
The diff coverage is n/a.

@@                 Coverage Diff                  @@
##             fix/crypto-plugin    #2289   +/-   ##
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  Coverage                     ?   99.45%           
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  Files                        ?      420           
  Lines                        ?    30655           
  Branches                     ?        0           
====================================================
  Hits                         ?    30488           
  Misses                       ?      167           
  Partials                     ?        0           

Flag	Coverage Δ
unittests	99.45% <0.00%> (?)

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