Tx builder and note encryption

[joebebel]

trafficstars

includes #30 with tx updates.

[codecov-commenter]

Codecov Report

Merging #31 (9d44705) into main (86de518) will increase coverage by 1.39%. The diff coverage is 45.68%.

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
+ Coverage   44.24%   45.64%   +1.39%     
==========================================
  Files          17       30      +13     
  Lines        1998     3545    +1547     
==========================================
+ Hits          884     1618     +734     
- Misses       1114     1927     +813     

Impacted Files	Coverage Δ
masp_primitives/src/asset_type.rs	91.30% <0.00%> (-8.70%)	:arrow_down:
masp_primitives/src/consensus.rs	0.00% <0.00%> (ø)
masp_primitives/src/constants.rs	88.88% <ø> (ø)
masp_primitives/src/convert.rs	90.00% <ø> (ø)
masp_primitives/src/transaction/builder.rs	0.00% <0.00%> (ø)
masp_proofs/src/circuit/convert.rs	63.23% <ø> (ø)
masp_proofs/src/circuit/pedersen_hash.rs	77.50% <ø> (ø)
masp_proofs/src/circuit/sapling.rs	66.66% <ø> (-0.11%)	:arrow_down:
masp_proofs/src/lib.rs	0.00% <ø> (ø)
masp_primitives/src/transaction/amount.rs	7.14% <7.14%> (ø)
... and 23 more

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