Make MeilisearchException as RuntimeException

[junghoon-vans]

Description

Currently, all exceptions thrown by the client inherit from the MeilisearchException.class.
However, MeilisearchException is a checked exception, so users who use it must handle the exception.
but enforcing this behavior is not modern.

Basic example

My suggestion is to change the MeilisearchException to a RuntimeException.
Users can only handle the exception if they need to.

Other

As far as I know, almost all datastore clients are designed to throw RuntimeException.