feat: added wallet side integration for neutrino

[manavdesai27]

This PR adds relevant code for wallet side integration for Neutrino. It is a work in progress.

[codecov]

Codecov Report

Patch coverage: 24.65% and project coverage change: -0.14 ⚠️

Comparison is base (b005869) 69.55% compared to head (d07744f) 69.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1159      +/-   ##
==========================================
- Coverage   69.55%   69.42%   -0.14%     
==========================================
  Files         158      158              
  Lines       26603    26672      +69     
==========================================
+ Hits        18505    18516      +11     
- Misses       8098     8156      +58     

Impacted Files	Coverage Δ
lib/client/node.js	26.78% <0.00%> (-0.49%)	⬇️
lib/wallet/client.js	0.00% <0.00%> (ø)
lib/wallet/walletdb.js	81.27% <5.26%> (-1.85%)	⬇️
lib/blockchain/chain.js	71.90% <16.66%> (-1.44%)	⬇️
lib/node/http.js	59.43% <20.00%> (-0.51%)	⬇️
lib/net/pool.js	59.19% <40.00%> (-0.06%)	⬇️
lib/blockchain/chaindb.js	78.16% <50.00%> (-0.29%)	⬇️
lib/wallet/nodeclient.js	77.04% <57.14%> (-2.96%)	⬇️
lib/wallet/nullclient.js	88.46% <100.00%> (+0.96%)	⬆️
lib/wallet/wallet.js	69.24% <100.00%> (+0.04%)	⬆️

... and 2 files with indirect coverage changes

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