Add polyfills for int.TryParse(string, IFormatProvider?, out int) and corresponding methods for other numeric types

[Tyrrrz]

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[Copilot]

Pull request overview

This PR adds polyfills for the simplified TryParse(string, IFormatProvider?, out T) methods that were introduced in .NET 7.0 for all numeric types. These polyfills enable backward compatibility with earlier .NET versions by delegating to the existing TryParse overloads with explicit NumberStyles parameters.

• Implements TryParse polyfills for 13 numeric types (byte, sbyte, short, int, long, ushort, uint, ulong, IntPtr, UIntPtr, float, double, decimal)
• Each polyfill correctly delegates to the existing 4-parameter TryParse overload with appropriate NumberStyles
• Updates documentation to reflect the addition of 13 new members

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
PolyShim/Signatures.md	Updates member count from 184 to 197 and total count from 246 to 259; adds documentation entries for all 13 new TryParse methods
PolyShim/Net70/Byte.cs	Adds TryParse polyfill for byte using NumberStyles.Integer
PolyShim/Net70/SByte.cs	Adds TryParse polyfill for sbyte using NumberStyles.Integer
PolyShim/Net70/Int16.cs	Adds TryParse polyfill for short using NumberStyles.Integer
PolyShim/Net70/Int32.cs	Adds TryParse polyfill for int using NumberStyles.Integer
PolyShim/Net70/Int64.cs	Adds TryParse polyfill for long using NumberStyles.Integer
PolyShim/Net70/Uint16.cs	Adds TryParse polyfill for ushort using NumberStyles.Integer (filename has incorrect casing)
PolyShim/Net70/UInt32.cs	Adds TryParse polyfill for uint using NumberStyles.Integer
PolyShim/Net70/UInt64.cs	Adds TryParse polyfill for ulong using NumberStyles.Integer
PolyShim/Net70/IntPtr.cs	Adds TryParse polyfill for IntPtr that delegates to int or long based on pointer size
PolyShim/Net70/UIntPtr.cs	Adds TryParse polyfill for UIntPtr that delegates to uint or ulong based on pointer size
PolyShim/Net70/Single.cs	Adds TryParse polyfill for float using NumberStyles.Float | NumberStyles.AllowThousands
PolyShim/Net70/Double.cs	Adds TryParse polyfill for double using NumberStyles.Float | NumberStyles.AllowThousands
PolyShim/Net70/Decimal.cs	Adds TryParse polyfill for decimal using NumberStyles.Number

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