Fixes OAuth1 signature with special characters (#2126, #1945)

[elia936]

Description

Fixes OAuth1 signature which is generated wrong when containing special characters
#2126 , #1945

Purpose

This pull request is a:

• [ x] Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[elia936]

@dotnet-policy-service agree

[alexeyzimarev]

Thank you for the PR. It would be great if you can add a test that would reproduce the issue, and turns green after the fix.

[teunlielu]

Example code can you found on bug: #2126

[teunlielu]

@alexeyzimarev wat need we more to merge code?
I see test code is add.

[alexeyzimarev]

@teunlielu done! sorry about the delay