- Introduce MailerSend as a new email provider option, including setup and usage examples.
- Enhance README with detailed sections on notification channels, provider strategies, and setup guides for a comprehensive understanding of the project's capabilities.

feat: add EmailMailerSendProvider for email notifications support

…bility and maintainability

feat(email): add MailerSend as a new email provider to expand service integrations

…ally include name only if present

…e for clarity

- Introduce messageId field to allow overriding the default message ID.
- Refactor email data construction using spread operators for cleaner, more readable code.
- Utilize modern JavaScript features for object manipulation, enhancing code maintainability and readability.

…e compatibility

style(mailersend.js): enforce consistent semicolons and formatting for clarity
chore: bump package version to 1.17.1 for release