feat: make registering author optional

[jrriehl]

Proposed changes

Authors should not need to register to get started developing AEAs.

With this change, users can still register with:

aea init --register

or

aea register

but by default, only the author handle will be setup (previously aea init --local).

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)
• [x] 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.

• [x] I have read the CONTRIBUTING doc
• [x] I am making a pull request against the develop branch (left side). Also you should start your branch off our develop.
• [x] 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.
• [x] I have added necessary documentation (if appropriate)
• [x] Any dependent changes have been merged and published in downstream modules

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 084c726):

https://fetch-docs-preview--pr2802-feat-optional-regist-zt2gz195.web.app

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_{Sign: f2de39fd4e81249941960b74fbab0a62d90d69f8}

[codecov-commenter]

Codecov Report

Merging #2802 (a7b901d) into develop (ef04074) will decrease coverage by 5.46%. The diff coverage is 100.00%.

:exclamation: Current head a7b901d differs from pull request most recent head 8fa6733. Consider uploading reports for the commit 8fa6733 to get more accurate results

@@             Coverage Diff             @@
##           develop    #2802      +/-   ##
===========================================
- Coverage    97.88%   92.41%   -5.47%     
===========================================
  Files          506      506              
  Lines        36146    36146              
===========================================
- Hits         35382    33405    -1977     
- Misses         764     2741    +1977     

Flag	Coverage Δ
unittests	92.41% <100.00%> (-5.47%)	:arrow_down:

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

Impacted Files	Coverage Δ
aea/cli/init.py	65.30% <100.00%> (-34.70%)	:arrow_down:
aea/test_tools/generic.py	19.75% <0.00%> (-80.25%)	:arrow_down:
aea/cli/upgrade.py	28.33% <0.00%> (-71.67%)	:arrow_down:
packages/fetchai/skills/erc1155_client/handlers.py	35.92% <0.00%> (-64.08%)	:arrow_down:
aea/cli/issue_certificates.py	36.76% <0.00%> (-63.24%)	:arrow_down:
aea/cli/get_multiaddress.py	37.93% <0.00%> (-62.07%)	:arrow_down:
aea/cli/eject.py	41.00% <0.00%> (-59.00%)	:arrow_down:
aea/manager/project.py	44.37% <0.00%> (-55.63%)	:arrow_down:
aea/cli/transfer.py	45.00% <0.00%> (-55.00%)	:arrow_down:
aea/cli/install.py	47.36% <0.00%> (-52.64%)	:arrow_down:
... and 46 more

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