Fix version displays of PSBT

[yanganto]

• add format checks of Psbt
• fix version display error of Psbt
• reference issue PSBT version is always 2 RGB-WG/rgb#191

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 0.0%. Comparing base (1cc6f51) to head (4c7ceec).
Report is 12 commits behind head on master.

❗ Current head 4c7ceec differs from pull request most recent head 2e3c1d1

Please upload reports for the commit 2e3c1d1 to get more accurate results.

Files	Patch %	Lines
psbt/src/lib.rs	0.0%	6 Missing ⚠️
psbt/src/data.rs	0.0%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #29    +/-   ##
======================================
  Coverage     0.0%   0.0%            
======================================
  Files          17     18     +1     
  Lines        3031   3191   +160     
======================================
- Misses       3031   3191   +160     

Flag	Coverage Δ
rust	0.0% <0.0%> (ø)

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[dr-orlovsky]

ACK 2e3c1d1