feat: switch to grpc-js, cleanup

[kincaidoneil]

Switch to native JS gRPC client instead of C++ bindings

• use the js version of grpc to eliminate native dep and electron issues
• use fork of protobufjs to generate types for lightning service
• remove old deps for generating types
• remove old promisify code/types

Miscellaneous

• fix: on connect/ws reconnect, invoice resharing should work (client unloads account on ws disconnect; loads and connects account on reconnect)
• fix: remove bolt11 (requires secp256k1 native dep), use LND call to decode invoices instead (temporarily, until it can be updated with pure js dep)
• chore: update and remove unnecessary deps
• general simplifications and cleanup

[codecov-io]

Codecov Report

Merging #30 into master will decrease coverage by 1.53%. The diff coverage is 90%.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
- Coverage   85.41%   83.88%   -1.54%     
==========================================
  Files           6        6              
  Lines         336      335       -1     
  Branches       17       17              
==========================================
- Hits          287      281       -6     
- Misses         44       50       +6     
+ Partials        5        4       -1

Impacted Files	Coverage Δ
src/plugins/client.ts	92.3% <100%> (+0.64%)	:arrow_up:
src/plugins/server.ts	90% <75%> (-5%)	:arrow_down:
src/types/plugin.ts	80% <80%> (ø)
src/lightning.ts	80.95% <87.5%> (-4.05%)	:arrow_down:
src/index.ts	90.1% <93.33%> (+1.09%)	:arrow_up:
src/account.ts	78.46% <94.73%> (-2.43%)	:arrow_down:

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