Fix: Port connector import documentation updates [4.3.0]

[wso2-engineering-bot]

This PR was automatically generated by Claude AI.

• Issue: Port add connector documentation updates #2081
• Type: Documentation
• Summary: Ported the connector import documentation updates from PR Update import connector documentation #2076 to version 4.3.0. Updated the full content of the adding-connectors.md file to match the 4.5.0 structure since the 4.3.0 documentation had a different, simpler format.

Changes Made:

1. Updated Method 2 to describe importing connectors via the mediation flow using + Add Module → + Import Module
2. Added Method 3 for importing connections using OpenAPI/gRPC definitions
3. Added two new images:
   • import-connector.gif - Demonstrates the new connector import workflow
   • import-connection.png - Shows the connection import interface

Image Verification:

All referenced images have been copied from the 4.5.0 branch and are accessible in this version. No broken image links have been added.

Style Scope Verification:

The entire document content was updated to match the 4.5.0 version as specified in the issue ("Update the full content in the page if the 4.3.0 documentation is different from the PR"). Microsoft Style Guide standards have been maintained in the ported content.

Verification:

Documentation builds successfully with mkdocs build. Note: There are pre-existing warnings in the repository unrelated to these changes.

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