NYC -> C8

[MicahMaphet]

Description

Migrate from nyc to c8.

Motivation

nyc doesn't support ES modules while c8 does

Changelog

• Replace nyc with c8
• Convert all .nycrc.yml files to .c8rc.json
• Convert all .mocharc.yml files to .mocharc.json; add recursive: true and extension: ".test.js"
• Simplify test scripts from glob patterns (nyc mocha 'ts_build/test/**/*.test.js') to directory specs (c8 mocha ts_build/test)
• Update bitcore-build gulp test:node task from nyc to c8
• Move crypto-rpc's inline c8 config from package.json into .c8rc.json
• bitcore-client: run compiled JavaScript instead of TyepScript via tsx
• bitcore-client: convert bitcore-node imports in wallet.test.ts to require() with paths corrected for the compiled location (ts_build/test/unit). Importing does type checking on bitcore-node which breaks.

Testing Notes

Run all tests and compare coverage

c8 counts every line

C8:

NYC:

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Checklist

• I have read CONTRIBUTING.md and verified that this PR follows the guidelines and requirements outlined in it.