Add ordinals and inscriptions functionality

[jadwahab]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 43.40% and project coverage change: -2.91 ⚠️

Comparison is base (f7971e5) 83.70% compared to head (7937c55) 80.80%.

❗ Current head 7937c55 differs from pull request most recent head 769e763. Consider uploading reports for the commit 769e763 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
- Coverage   83.70%   80.80%   -2.91%     
==========================================
  Files          34       37       +3     
  Lines        3701     3985     +284     
==========================================
+ Hits         3098     3220     +122     
- Misses        434      546     +112     
- Partials      169      219      +50     

Impacted Files	Coverage Δ
output.go	86.95% <ø> (ø)
utxo.go	75.00% <ø> (ø)
inscriptions.go	28.00% <28.00%> (ø)
tx.go	76.07% <28.57%> (-1.22%)	⬇️
unlocker/simple.go	59.09% <33.33%> (-5.91%)	⬇️
bscript/script.go	59.59% <37.70%> (-5.66%)	⬇️
ord/bidding.go	50.00% <50.00%> (ø)
ord/listing.go	52.23% <52.23%> (ø)

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[jadwahab]

Note sure if we should split out the ordinals files into a separate directory/module or keep them in the main bt module package. We could even potentially make the receiver functions on bt.Tx but I think it's better to keep it a separate function that takes the tx in the Args struct.

Leaning towards separating out, but if anyone has any better ideas please let me know.