Typescript, CI, start/stop methods, dev script, and new options

[Nathan-Schwartz]

Changes:

User facing:

• Expose TS typings Added a typings file to work with Type Script #4
• Switch to ESM
• Allow stopping and starting a node Gracefully close #9
• Add an autoStart option
• Add an enableStrictWeightMode option to be more aggressive about making the highest-weighted node the leader (may help with Cluster leader election multiple issues mKeRix/room-assistant#860)
• Change isLeader() implementation such that it isn't reliant on object key iteration order, which could have potentially returned false if the current node was a leader and another node was still reporting themself as a leader. If this occurred, it would mean the runoff elections might not occur when necessary, which could result in multiple leaders existing indefinitely.

Dev facing:

• Remove the deprecated shortid package and replace it with nanoid
• Update eslint packages and add a script for linting
• Introduce Github actions to run linting and type checking on PRs and pushes
• Mark internal-only methods as private
• Introduce a dev script to easily run a 3 node cluster that watches for file changes
• Resolve Bump path-parse from 1.0.6 to 1.0.7 #17, Bump hosted-git-info from 2.7.1 to 2.8.9 #16, Bump lodash from 4.17.11 to 4.17.21 #15, Bump acorn from 6.0.4 to 6.4.1 #13, Bump eslint-utils from 1.3.1 to 1.4.2 #11, Bump js-yaml from 3.12.0 to 3.13.1 #8 as well

[Nathan-Schwartz]

Hey @goldfire, I'm sure you're busy but I'd love to get some feedback on this when you get time 🙂

[Nathan-Schwartz]

@goldfire do you have an idea of when you'll get a chance to review this? Thanks!