Make the used-in-pub-interfaces TransactionOutputs type alias pub

[TheBlueMatt]

No description provided.

[devrandom]

ACK

[codecov]

Codecov Report

Merging #886 (ffedc05) into main (feeb893) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #886      +/-   ##
==========================================
- Coverage   90.26%   90.22%   -0.04%     
==========================================
  Files          55       55              
  Lines       29088    29088              
==========================================
- Hits        26255    26244      -11     
- Misses       2833     2844      +11     

Impacted Files	Coverage Δ
lightning/src/chain/channelmonitor.rs	95.45% <ø> (ø)
lightning/src/ln/functional_tests.rs	96.86% <0.00%> (-0.20%)	⬇️

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