bug: fix flaky test, add relaxed json escaping

[hjgraca]

Please provide the issue number

Issue number: #201

Summary

Currently the plus sign is escaped and transformed into "\u002B". This is not the expected behaviour because it will break bas64 encoding/decoding.

Added new test that tests a static string that contains + sign when encoded.

Changes

jsonOptions.Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping;

User experience

Please share what the user experience looks like before and after this change

Checklist

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• Meets tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[amirkaws]

LGTM