Ability to ignore files from build and livesync

[teobugslayer]

Users should be able to setup the CLI to ignore particular files, usually ts, .d.ts, or other source files in a language that compiles to JS / CSS.

We can use the same rules, default rules and implementation code from AppBuilder CLI.

Things to consider:

• We can move the rules into package.json, introduce a dedicated .tnsignore file, or use .abignore file - the latest option brings 100% interoperability with Telerik Platform
  • Implement interoperability with AppBuilder- i.e. appbuilder init from existing {N} project should consume existing {N} specific ignore rules.

[dtopuzov]

This is must have after we enabled transpilers.

[rosen-vladimirov]

Let's use .abignore - this way the project will work like a charm inside AppBuilder :)