Add request to ErrorHandler

[magro]

So that the error handler can use information of the request for handling the error, e.g. to log the request uri or some headers.

Note that this is a binary incompatible change (consider to bump the major version)! Reasoning: Trying to achieve this change in a binary compatible manner is considered to be adding too much (unnecessary) code, compared to how easy it is for library users to handle this change. Additionally, only users with a custom error handler would be affected.

[magro]

Ping @cdimascio 😊

[magro]

Another ping @cdimascio :wave:

[magro]

Yet another ping @cdimascio :thinking:

[magro]

Again, @cdimascio :wave:

[magro]

Hey @cdimascio, me pinging again :-)

[cdimascio]

@magro if we make request the last parameter in the list with a default value are we able to maintain backward compatibility?

[cdimascio]

this is available in the latest version 4.1.0