refactor(verification): move token info [part 2b/9]

[glevco]

Depends on #831

Motivation

During the verification refactors, some methods were moved from Transaction to TransactionVerifier. Now that the refactors are complete (with PRs still to be merged), it's clear that those methods should be indeed in Transaction, so they were moved back.

Acceptance Criteria

• Move update_token_info_from_outputs() from TransactionVerifier to Transaction, changing it to private.
• Move get_complete_token_info() from TransactionVerifier to Transaction.
• Change Transaction.get_token_info_from_inputs() to private.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (351e4d3) 85.28% compared to head (5693c13) 85.27%.

Files	Patch %	Lines
hathor/transaction/transaction.py	90.47%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #858      +/-   ##
==========================================
- Coverage   85.28%   85.27%   -0.02%     
==========================================
  Files         281      281              
  Lines       22363    22364       +1     
  Branches     3388     3388              
==========================================
- Hits        19073    19071       -2     
  Misses       2610     2610              
- Partials      680      683       +3     

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The base branch was changed.