chore: enable renovate and add configurations

[eranshmil]

https://renovatebot.com/docs/configuration-options/

Explantaion about important configurations:

• rangeStrategy: "bump" - bump the range even if the new version satisfies the existing range
• separateMajorMinor: false - will upgrade dependencies to latest release only, and not separate major/minor branches.
• schedule - run weekly upgrade checks after 9PM on Saturday, UTC time.
• ignoreDeps: [ "@types/node" ] - prevent upgrades of the node typings.
• major: { "devDependencies": { "enabled": false } } - don't upgrade major versions in devDependencies.
• packageRules:
  1. @angular/* (dependencies) -> @angular
  2. @angular* (devDependencies) -> @angular-dev (including @angular-devkit)
  3. typescript - update only patch versions
  4. @ngxs/* -> @ngxs
  5. karma* -> karma
  6. jasmine* -> jasmine
  7. @types/* -> @types
  8. @ionic* -> @ionic

[eranshmil]

@markwhitfeld