chore: update @typescript-eslint to v2

[G-Rath]

What did you implement:

Updates to the next major version of @typescript-eslint - it's not the highest, but it's higher :)

How did you implement it:

Because of changes in how linting works, I had to create a new configuration for TypeScript to use when building that just includes the project files - that way the main config can include all files which is needed for @typescript-eslint to be able to lint them properly with typechecking.

This is a common pattern that I use in my most of my projects, and has the same build output.

How can we verify it:

Run the linting and compiling commands.

Also, running colordiff -r against the lib generated by npm run compile on master vs this branch shows no differences:

serverless-azure-functions on  master [?] is 📦 v2.2.1 via  v18.11.0
❯ colordiff -r lib lib2

serverless-azure-functions on  master [?] is 📦 v2.2.1 via  v18.11.0
❯ echo $?
0

Todos:

Note: Run npm run test:ci to run all validation checks on proposed changes

• Ensure there are no lint errors.
  Validate via npm run lint
  Note: Some reported issues can be automatically fixed by running npm run lint:fix
• Write tests and confirm existing functionality is not broken.
  Validate via npm test
• Write documentation
• Provide verification config / commands / resources
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[G-Rath]

@gligorkot let me know if you'd like the TypeScript build change pulled out into its own PR for tidiness :)

[gligorkot]

Good work @G-Rath, thank you for this.