Allow stringMap annotation values containing equal sign

[kishorj]

Fixes #1673
Fix stringMap annotation type to accept values with the equal sign. For example, the following annotation will now be accepted -

alb.ingress.kubernetes.io/tags: foo=ZXF1YWxzCg==, another=tag" 

and would be parsed to

map[string]string{	"foo": "ZXF1YWxzCg==,",	"another": "tag", } 

[M00nF1sh]

/lgtm
nice 👍

[k8s-ci-robot]

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This pull-request has been approved by: kishorj, M00nF1sh
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[codecov-io]

Codecov Report

Merging #1674 (66a8dca) into main (15066ef) will not change coverage.
The diff coverage is 100.00%.

@@ Coverage Diff @@ ## main #1674 +/- ## ======================================= Coverage 46.04% 46.04% ======================================= Files 110 110 Lines 5916 5916 ======================================= Hits 2724 2724 Misses 2926 2926 Partials 266 266 

Impacted Files	Coverage Δ
pkg/annotations/parser.go	88.15% <100.00%> (ø)

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