Added get_page_id() and get_page_by_title() method for Cloud using V2 API

[dskdata]

Summary

Add Confluence Cloud V2 support for looking up a page by its space key and title.

• Added get_page_by_title() to ConfluenceCloud.
  • Resolves the supplied space key to a space ID.
  • Queries the Cloud V2 pages endpoint using the space ID and page title.
  • Requests a maximum of one matching page.
  • Preserves the legacy {"results": [...]} response shape for compatibility.
• Added get_page_id() to return the ID of the first matching page.
• Added support for the optional body_format and pagination-related arguments through get_page_by_title()

Compatibility

• Existing V2 methods and response formats are unchanged.
• The new methods are compatible with callers that previously expected a V1-style results collection.
• No credentials or environment-specific configuration are included.

Validation

Manually validated against Confluence Cloud using:

result =confluence_client.get_page_by_title("SPACE_NAME","PAGE_NAME")

page_id  = confluence_client.get_page_id("SPACE_NAME","PAGE_NAME")

Which returned expected page and page ID.

#1658 Finally, this PR aims to solve this open issue #1658