Add and configure ESLint and update configuration for Prettier (#617)

* Add ESLint, update Prettier

* Update docs

* Update tests

* Update licenses

* Fix review points

.github/workflows/codeql-analysis.yml

@@ -2,12 +2,12 @@ name: CodeQL analysis
 
 on:
   push:
-    branches: [ 'main' ]
+    branches: ['main']
   pull_request:
   schedule:
     - cron: '0 3 * * 0'
 
 jobs:
   call-codeQL-analysis:
-    name: CodeQL analysis 
-    uses: actions/reusable-workflows/.github/workflows/codeql-analysis.yml@main
+    name: CodeQL analysis
+    uses: actions/reusable-workflows/.github/workflows/codeql-analysis.yml@main