add new capabilities to application

[SecondeJK]

This PR adds missing functionality when creating a new application.

Description

Region, conversations_ttl and signed_callbacks are now settable on an application object when sending a request to create. Webhooks were also missing the ability to set socket and connection timeouts, which have now been added.

Motivation and Context

Missing functionality

How Has This Been Tested?

Couple of new tests have been written to cover this.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.