Allow leaving encoded slash in UrlSegmentParameter value

[cg-finbourne]

Description

We need to use path parameters which include the sequence of characters '%2F' or '%2f' in them. The constructor of UrlSegmentParameter replaces these sequences in the value with a '/' character. When using version 110.2.0 of RestSharp we would get around this by setting the Value property with the original string after the creation of the UrlSegmentParameter, but at 112.0.0 this is no longer possible as the Value property is now readonly after creation.

This pull request adds an optional parameter to the UrlSegmentParameter constructor to give control over whether the value is changed to replace '%2F' or not.

(we cannot create a new class with the desired behaviour since the UrlSegmentParameter type is used in this line https://github.com/restsharp/RestSharp/blob/dev/src/RestSharp/Request/UriExtensions.cs#L57)

Purpose

This pull request is a:

• 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)

[cg-finbourne]

@dotnet-policy-service agree [company="finbourne"]

[cg-finbourne]

@dotnet-policy-service agree company="finbourne"

[cg-finbourne]

I have created this issue for it #2267

[github-actions]

Test Results

   35 files     35 suites   17m 18s ⏱️
  446 tests   446 ✅ 0 💤 0 ❌
3 020 runs  3 020 ✅ 0 💤 0 ❌

Results for commit 3cbd7ad.