[IMPR] Add built-in, predefined keywords to use

[szikszail]

Summary

Add built-in, predefined keywords to use in the replacer, so they can be more easily used instead of setting them in the configuration file.

Use cases

There are two prominent use cases:

1. Including UUID in certain places
2. Including environment variables (handled in separate issue)

Example

Input:

Feature: Some feature
  Scenario: Creating a new user
    Given the registration page is opened
    When the username is filled with "user_${UUID}"
    Then the username should contain "user_${UUID}"

Output:

Feature: Some feature
  Scenario: Creating a new user
    Given the registration page is opened
    When the username is filled with "user_9cef15df-d251-4bf4-bd7a-dd2afff2829c"
    Then the username should contain "user_9cef15df-d251-4bf4-bd7a-dd2afff2829c"

Options/Variants

• Adding different versions: UUID (=UUID4), UUID1, UUID2, UUID3, UUID4, NANOID
• Adding scoped versions: SCENARIO_UUID, FEATURE_UUID, EXAMPLES_UUID, etc

Additional context

• The value of UUID* would be unique every time
• The value of the scoped UUID* would be a unique one per the scope