Update build and repo config to match ImageSharp

[JimBobSquarePants]

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

• Use MinVer for build numbers.
• Add SourceLink and deterministic builds
• Update ImageSharp
• Add new sponsorship details.

[codecov]

Codecov Report

Merging #102 into master will decrease coverage by 0.54%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage   77.63%   77.08%   -0.55%     
==========================================
  Files          46       46              
  Lines        1292     1292              
  Branches      224      207      -17     
==========================================
- Hits         1003      996       -7     
- Misses        222      234      +12     
+ Partials       67       62       -5     

Flag	Coverage Δ
#unittests	77.08% <ø> (-0.55%)	⬇️

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

Impacted Files	Coverage Δ
...harp.Web/Middleware/ImageSharpMiddlewareOptions.cs	56.00% <0.00%> (-12.00%)	⬇️
...eSharp.Web/Providers/PhysicalFileSystemProvider.cs	80.00% <0.00%> (-5.00%)	⬇️
src/ImageSharp.Web/ChunkedMemoryStream.cs	73.55% <0.00%> (-1.93%)	⬇️
.../ImageSharp.Web/Middleware/ImageSharpMiddleware.cs	73.28% <0.00%> (ø)
src/ImageSharp.Web/ImageCacheMetadata.cs	81.81% <0.00%> (+1.81%)	⬆️

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[tocsoft]

lgtm 👍