Added wallet.getUnconfirmedBalance RPC

[aikchun]

What kind of PR is this?:

/kind feature

What this PR does / why we need it:

Added getUnconfirmedBalance RPC

1. wallet.getUnconfirmedBalance

Which issue(s) does this PR fixes?:

Fixes getunconfirmedbalance #48

Did not test for getUnconfirmedBalance(true) because it is not tested or used any where in any app.
Did not test for untrusted_pending because requires multi-node set up.

[codeclimate]

Code Climate has analyzed commit a17ab33 and detected 0 issues on this pull request.

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[netlify]

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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
packages/jellyfish/dist/index.umd.js	20.37 KB (+0.09% 🔺)	408 ms (+0.09% 🔺)	170 ms (-2.41% 🔽)	578 ms

[codecov]

Codecov Report

Merging #354 (a17ab33) into main (00986ae) will increase coverage by 4.22%.
The diff coverage is 98.02%.

@@            Coverage Diff             @@
##             main     #354      +/-   ##
==========================================
+ Coverage   92.98%   97.21%   +4.22%     
==========================================
  Files          10       94      +84     
  Lines         171     2690    +2519     
  Branches       19      344     +325     
==========================================
+ Hits          159     2615    +2456     
- Misses         12       75      +63     

Impacted Files	Coverage Δ
...llyfish-transaction/src/buffer/buffer_bignumber.ts	100.00% <ø> (ø)
...jellyfish-transaction/src/buffer/buffer_bitmask.ts	100.00% <ø> (ø)
...ellyfish-transaction/src/buffer/buffer_composer.ts	99.50% <ø> (ø)
...jellyfish-transaction/src/buffer/buffer_varuint.ts	100.00% <ø> (ø)
packages/jellyfish-transaction/src/index.ts	100.00% <ø> (ø)
...ckages/jellyfish-transaction/src/script/_buffer.ts	100.00% <ø> (ø)
...ckages/jellyfish-transaction/src/script/bitwise.ts	100.00% <ø> (ø)
...ages/jellyfish-transaction/src/script/constants.ts	100.00% <ø> (ø)
...ckages/jellyfish-transaction/src/script/control.ts	100.00% <ø> (ø)
...ackages/jellyfish-transaction/src/script/crypto.ts	100.00% <ø> (ø)
... and 158 more

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