Maintain checker specific timeouts

[karthikmuralidharan]

In addition to a common and overall timeout value defined for all health checkers, it'll be useful to override with a specific timeout value for a checker.

Concern:
My assumption is that it will be useful for smaller timeout values when compared to an overall timeout across all checkers, when we want to guarantee strict response times of the dependency.

Does it even make sense to allow a higher value than the overall checker limit ? How would the implementation change.