Add polyfills for DateTime.TryParse(string, IFormatProvider, out DateTime) and equivalent for DateTimeOffset

[Tyrrrz]

No description provided.

[Copilot]

Pull request overview

This PR adds polyfills for the simplified TryParse overloads introduced in .NET 7.0 for DateTime and DateTimeOffset types. These overloads accept a string and an IFormatProvider without requiring explicit DateTimeStyles parameters.

• Adds DateTime.TryParse(string?, IFormatProvider?, out DateTime) polyfill
• Adds DateTimeOffset.TryParse(string?, IFormatProvider?, out DateTimeOffset) polyfill

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
PolyShim/Signatures.md	Updated documentation to reflect the addition of 2 new TryParse method signatures and incremented total member count from 211 to 213
PolyShim/Net70/DateTime.cs	Implements the .NET 7.0 DateTime.TryParse polyfill by delegating to the existing overload with DateTimeStyles.None
PolyShim/Net70/DateTimeOffset.cs	Implements the .NET 7.0 DateTimeOffset.TryParse polyfill by delegating to the existing overload with DateTimeStyles.None

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (a8ce085) to head (2a0c408).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

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##   master   #61   +/-   ##
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