Migrate to eslint

[ghost]

Issue #, if available:

#729

Description of changes:

TSLint is not evolving anymore, it is recommended to migrate to ESLint and that's what this PR is doing. I have also disabled all recommended rules that fail for current code base - can be fixed in further PRs. Notes:

• TSLint was not connected to builds at all, and when I tried to run it manually multiple checks failed. I am enabling linting checks as a part of build process.
• We cannot use the latest versions of ESLint and plugins as this library still supports Node v10.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[zslayton]

Thanks for putting this together! I notice it's still in draft mode, were you planning to wait until the dependency on node v10 was removed?

[zslayton]

Could you have this target the 5.0.0-development branch so we can include it in the next release? The dependency on Node v10 has already been removed there.