Update generic exception `MeilisearchException` to throw more accurate Exception

[239yash]

Pull Request

Related issue

Fixes #678

What does this PR do?

• PR updates the generic exception(MeilisearchException) throws from function to exact exception throws
• Created a new exception MeilisearchUrlException for handling MalformedUrlException

PR checklist

Please check if your PR fulfills the following requirements:

• [x] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• [x] Have you read the contributing guidelines?
• [x] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!