Group all timeouts in nuclei to single struct and derive from single value

[tarunKoyalwar]

Please describe your feature request:

• In Nuclei to improve performance and handle unexpected situations , we have employed timeouts in multiple places for example

MaxResponseHeaderTimeout -> [10 sec] -> time to wait for first byte of http response to be returned

ResponseReadTimeout (-rrt) -> [5 sec] -> network protocol conn read timeout

JsCompilerExecutionTimeout -> 1.5  x `-timeout` flag

HttpTimeout -> 3.0 x `-timeout` flag

DialTimeout -> `-timeout` flag

...

These heirarchical timeout handles conn hangs and other issues , while this is working and good , there is need to group all these together in a single struct say TimeoutVariants or something and allow configuring these from sdk

To improve UX, instead of adding flag for each timeout variant we should dervie all these values using multipliers from single flag i.e -timeout

[tarunKoyalwar]

Currently the TimeoutVariants struct is expected to be added as field in ExecuterOptions