feat: enhance channel configuration UI and validation

- Updated ChannelInstructionsPanel to include a button for viewing documentation, improving user guidance.
- Enhanced ChannelTokenField to support showing/hiding secret values with appropriate labels and icons.
- Refined ChannelTypeSelector to display connection type icons and improved layout for better user experience.
- Added new messages for documentation links, validation feedback, and secret management in i18n.
- Extended ChannelMeta to include optional documentation URLs for better context on configuration fields.
- Implemented credential validation logic in ChannelsPage to ensure user inputs are validated before saving.
- Introduced ChannelLogo component to display channel icons in the UI.
- Added tests for channel credential validation to ensure proper error handling and feedback.

src/assets/channels/whatsapp.svg

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