tslint is deprecated

[loreanvictor]

Describe the bug

tslint is deprecated.

To Reproduce

1. Clone the repository,
2. Run yarn install and you will see the deprecation errors,
3. Run yarn lint:ts and you will see tons of deprecation errors.

Expected behavior

Apollon uses eslint and typescript-eslint.
Also linting rules work properly, and if there are any rules that the new linters no longer support, code is changed accordingly (this seems to be a time-consuming task as a result of this requirement).

Environment

Its on all environments (deprecation is environment independent).

Additional context

I tried to migrate using this script suggested by TSLint project itself, but there are a lot of corrections needed still, so I am creating this issue so that we can resolve it in due time.