feature: Early or lazy channel creation configuration option

[gabheadz]

Description

• Provided a boolean configuration option in the yaml file named create_channel_early. When true (default), after calling the /create endpoint a Channel GenStateMachine process is inmediatelly created and started in waiting state.

  When this option is false, the Channel GenStateMachine process is created only when there is a websocket or sse connection.

• Adjusted a timer to control how often a token life remaining validation ocurs.

• Bump version of some dependencies.

Category

• Feature
• Fix

Checklist

• The pull request is complete according to the guide of contributing
• Automated tests are written
• The documentation is up-to-date
• the version of the mix.exs was increased
• The pull request has a descriptive title that describes what has changed, and provides enough context for the changelog