Aws s3 client timeout

[mdupras]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
• I have provided test coverage for my change (where applicable)

Description

Most configurations of the S3Client can be set via environment variable, but it is not the case for the Timeout settings. I've only added a config and forwarded it.

[codecov]

Codecov Report

Merging #287 (0823d89) into main (7e41144) will decrease coverage by 0%.
The diff coverage is 75%.

@@         Coverage Diff         @@
##           main   #287   +/-   ##
===================================
- Coverage    85%    85%   -1%     
===================================
  Files        76     76           
  Lines      2165   2173    +8     
  Branches    303    304    +1     
===================================
+ Hits       1851   1857    +6     
- Misses      229    231    +2     
  Partials     85     85           

Flag	Coverage Δ
unittests	85% <75%> (-1%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...geSharp.Web.Providers.AWS/AmazonS3ClientFactory.cs	31% <66%> (+16%)	⬆️
....Providers.AWS/Caching/AWSS3StorageCacheOptions.cs	85% <100%> (+2%)	⬆️
....AWS/Providers/AWSS3StorageImageProviderOptions.cs	87% <100%> (+1%)	⬆️

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[JimBobSquarePants]

Looks great! Thanks for your help here!