Is your feature request related to a problem? Please describe.
Provide regex patterns for common use cases like:

• URL
• email
• hashtags
• hex color

Each pattern should be available in two versions:

• validator - the goal of this pattern type is to validate that given string is a valid email, url, etc. This type of pattern should focus on RFC/standards compliance.
• finder - the goal of this pattern type is to effectively find given types of patterns (e.g. emails, hashtags, etc) in a longer text. This pattern types aims to be 90% in order to improve efficiency.

Describe the solution you'd like
Patterns will be imported through ts-regex-builder/patterns import. See #72 for implementation of that part.

Whole library is and should remain tree-shakable, so that unused patterns (and features) are removed by bundlers in order to reduce bundle size.

Describe alternatives you've considered

1. Providing pattens in examples/docs - this is an extra step and potentially hard to discover
2. Do nothing - making correct version of certain patterns (e.g. URL) is hard, and we as the library providers can make user life easier here.

Checklist (for each pattern)

• Implementation
• Tests
• API docs
• README docs (if relevant)

CC: @PaulJPhilp