WIP: Updating whole of source code

[Ikuyadeu]

What problem did you solve?

• Fix for the new eslint rules (Now in progress)
  Current style plugin:@typescript-eslint/eslint-recommended was suitable for JavaScript.
  I add the other extends

• eslint:recommended: Same with 'plugin:@typescript-eslint/eslint-recommended'

• plugin:@typescript-eslint/recommended: Recommended rules for the TypeScript

• Refactor session.ts
  Current session.ts has too many global values,

export let globalenv: any;
let resDir: string;
let watcherDir: string;
let requestFile: string;
let requestLockFile: string;
let requestTimeStamp: number;
let sessionDir: string;
let pid: string;
let globalenvFile: string;
let globalenvLockFile: string;
let globalenvTimeStamp: number;
let plotView: string;
let plotFile: string;
let plotLockFile: string;
let plotTimeStamp: number;
let plotDir: string;
let requestWatcher: FSWatcher;
let globalEnvWatcher: FSWatcher;
let plotWatcher: FSWatcher;

to help code understanding, it should be included in the function declaration.

• Clean up extension.ts

Current extension.ts has many functions like getBracketCompletionItems.
They should be each other files, and extension.ts will just call them.
Personally, break loop1; is not good for understanding code flows. it can be more easily.

Unfortunately, I do not have enough knowledge for the R, so I will not touch init.R in this PR.

• Apply super-linter

[Ikuyadeu]

Instead of eslint, I added super-linter it is published as the GitHub officially.

[Ikuyadeu]

Duplicated with #474