API improvements for v0.11

[dr-orlovsky]

These are small API changes which were required during the current work on RGB standard library v0.11

[cryptoquick]

ACK

[codecov]

Codecov Report

Attention: 119 lines in your changes are missing coverage. Please review.

Comparison is base (aacb019) 49.5% compared to head (4f93149) 48.8%.

❗ Current head 4f93149 differs from pull request most recent head 3ad4349. Consider uploading reports for the commit 3ad4349 to get more accurate results

Files	Patch %	Lines
dbc/src/opret/spk.rs	0.0%	22 Missing ⚠️
consensus/src/coding.rs	0.0%	19 Missing ⚠️
dbc/src/opret/tx.rs	0.0%	19 Missing ⚠️
dbc/src/anchor.rs	0.0%	18 Missing ⚠️
dbc/src/opret/txout.rs	0.0%	11 Missing ⚠️
consensus/src/tx.rs	0.0%	9 Missing ⚠️
dbc/src/opret/mod.rs	25.0%	6 Missing ⚠️
dbc/src/tapret/xonlypk.rs	66.7%	4 Missing ⚠️
consensus/src/script.rs	0.0%	3 Missing ⚠️
dbc/src/tapret/mod.rs	0.0%	3 Missing ⚠️
... and 3 more

Additional details and impacted files

@@           Coverage Diff            @@
##           master     #68     +/-   ##
========================================
- Coverage    49.5%   48.8%   -0.7%     
========================================
  Files          29      34      +5     
  Lines        3070    3123     +53     
========================================
+ Hits         1520    1525      +5     
- Misses       1550    1598     +48     

Flag	Coverage Δ
rust	48.8% <18.5%> (-0.7%)	⬇️

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