Add support for custom packages

[angrybayblade]

Proposed changes

This PR

• Adds support for custom package type
• Updates the package manager to manage custom package types
• Updates fetch command to fetch custom packages when fetching an agent

Fixes

fixes #706

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

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• 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

[angrybayblade]

With custom package type you can define you a custom package for a skill or an agent. The custom package should be defined via a component.yaml file. The config file should look like this

name: comonent
author: valory
version: 0.1.0
type: custom
description: The custom component package.
license: Apache-2.0
aea_version: '>=1.0.0, <2.0.0'
fingerprint:
  __init__.py: bafybeidey4syohls5hxmso6qsp5p4uhtzle5txv2mlbym6ktjzknich6oa
  kelly_criterion.py: bafybeibqwl52cnz64cysjd2jnjijuakdvyrffapxq65cdzx6g65gu42deq
fingerprint_ignore_patterns: []
dependencies: {}

The custom component also allows you to define extra parameters like here. At the runtime you can access these parameters using component.get method. Eg component.get("entry_point")

These components can be defined as a dependencies for skill and agent packages to manage python dependencies.

(...)
customs:
- valory/component:0.1.0:bafybeib3mrksfhsym4xktqx44vbpbtbcl57l3tfjh5ev7k6g27pqa4grmy
(...)

[codecov-commenter]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (1408e07) 90.29% compared to head (abb8a89) 90.26%.

Files	Patch %	Lines
aea/configurations/base.py	65.62%	11 Missing ⚠️
aea/cli/scaffold.py	85.71%	1 Missing ⚠️
aea/cli/utils/context.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #717      +/-   ##
==========================================
- Coverage   90.29%   90.26%   -0.03%     
==========================================
  Files         371      373       +2     
  Lines       29807    29854      +47     
==========================================
+ Hits        26914    26949      +35     
- Misses       2893     2905      +12     

Flag	Coverage Δ
unittests	90.26% <75.92%> (-0.03%)	⬇️

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[angrybayblade]

You can also scaffold custom components using aea scaffold custom

[DavidMinarsch]

Before merging this, please ensure it works downstream in open-autonomy and also in mech repo where there are custom packages already