feat: imds mock can be launched with a configurable set of instance tags

[purpleclay]

closes #10

[codecov]

Codecov Report

Merging #13 (f55ba97) into main (7cb0902) will decrease coverage by 1.20%.
The diff coverage is 44.44%.

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
- Coverage   77.47%   76.27%   -1.21%     
==========================================
  Files           9        9              
  Lines         293      295       +2     
==========================================
- Hits          227      225       -2     
- Misses         61       64       +3     
- Partials        5        6       +1     

Impacted Files	Coverage Δ
cmd/root.go	0.00% <0.00%> (ø)
pkg/imds/patch/func.go	100.00% <ø> (ø)
pkg/imds/patch/instancetag.go	100.00% <ø> (ø)
pkg/imds/server.go	88.04% <57.14%> (-3.17%)	⬇️

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