add SendEventWithContext method

[viglia]

This will let us pass a context.Context when creating a new request with getRequestFromEvent.

This will let us have a more granular control over how/when we cancel a request instead of relying only on the client timeout.

For example, if such API is invoked while serving another HTTP request, we might want to take advantage of such request context to bail out earlier than the client timeout if necessary.

As per documentation:

For outgoing client requests, the context controls cancellation.

For incoming server requests, the context is canceled when the client's connection closes, the request is canceled (with HTTP/2), or when the ServeHTTP method returns.

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 81.73%. Comparing base (9a9f285) to head (29b6dad).

Files	Patch %	Lines
transport.go	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #824      +/-   ##
==========================================
- Coverage   81.74%   81.73%   -0.02%     
==========================================
  Files          50       50              
  Lines        4427     4434       +7     
==========================================
+ Hits         3619     3624       +5     
- Misses        659      660       +1     
- Partials      149      150       +1     

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[cleptric]

Could you add a bit more about the why?