Revert "remove double encoding of payload and signature fields for intoto v0.0.2"

[bobcallaway]

Because this changes the canonicalization of entries into the log, this will need to be implemented as v0.0.3 of the intoto type

Reverts #1150

[codecov-commenter]

Codecov Report

Merging #1158 (b424212) into main (6f7e892) will decrease coverage by 0.02%.
The diff coverage is 53.33%.

@@            Coverage Diff             @@
##             main    #1158      +/-   ##
==========================================
- Coverage   63.98%   63.95%   -0.03%     
==========================================
  Files          82       82              
  Lines        7635     7621      -14     
==========================================
- Hits         4885     4874      -11     
+ Misses       2119     2117       -2     
+ Partials      631      630       -1     

Flag	Coverage Δ
e2etests	48.90% <46.66%> (+0.07%)	⬆️
unittests	41.47% <33.33%> (-0.09%)	⬇️

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Impacted Files	Coverage Δ
pkg/api/entries.go	63.99% <0.00%> (ø)
pkg/types/intoto/v0.0.2/entry.go	70.31% <61.53%> (+0.62%)	⬆️
pkg/types/alpine/v0.0.1/entry.go	71.13% <0.00%> (-1.22%)	⬇️

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