Support poet certificates

[poszu]

Motivation

Closes #5204

Changes

Added support for registering in the poet services using a certificate instead of PoW. It still supports both ways and will fallback to the PoW if:

• certificate is not available (couldn't certify)
• the poet service doesn't support certificates

There is a new interface in activation package certifierService that provides a generic way to obtain a certificate for a given poet. It abstracts away the fact that a POST proof is used - it is hidden in certifierServiceClient, which could in future have different implementations for other poet services.

Changed the initial_post table to post as it now holds the latest POST proof. Relying solely on initial post proof OR an existing ATX could not work in case of a checkpoint (in fact this way it failed systests).

Test Plan

• added UTs
• added system tests

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[codecov]

Codecov Report

Attention: Patch coverage is 79.25408% with 89 lines in your changes are missing coverage. Please review.

Project coverage is 80.5%. Comparing base (8dcd43d) to head (c0b306c).

Files	Patch %	Lines
activation/certifier.go	73.9%	36 Missing and 22 partials ⚠️
sql/localsql/nipost/post.go	79.5%	9 Missing and 1 partial ⚠️
activation/nipost.go	86.2%	3 Missing and 4 partials ⚠️
activation/poet.go	78.5%	3 Missing and 3 partials ⚠️
sql/localsql/certifier/db.go	87.8%	3 Missing and 1 partial ⚠️
activation/activation.go	88.2%	2 Missing ⚠️
node/node.go	91.6%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #5221     +/-   ##
=========================================
- Coverage     80.5%   80.5%   -0.1%     
=========================================
  Files          286     288      +2     
  Lines        29547   29878    +331     
=========================================
+ Hits         23812   24063    +251     
- Misses        4137    4185     +48     
- Partials      1598    1630     +32     

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