Rename NDirect -> PInvoke

[jkotas]

No description provided.

[Copilot]

Pull Request Overview

This PR renames "NDirect" terminology to "PInvoke" throughout the codebase to improve clarity and consistency. NDirect was an older term used internally to refer to Platform Invoke (P/Invoke) functionality for calling native code from managed code.

• Renames classes, methods, and variables from NDirect* to PInvoke*
• Updates comments and documentation to use PInvoke terminology
• Maintains the same functionality while improving code readability

Reviewed Changes

Copilot reviewed 93 out of 93 changed files in this pull request and generated 3 comments.

File	Description
Multiple .cpp/.h files	Rename NDirectMethodDesc to PInvokeMethodDesc and related methods
Assembly files	Update function names from NDirectImportThunk to PInvokeImportThunk
Header files	Rename class declarations and type definitions
Documentation/comments	Update terminology from NDirect to PInvoke throughout

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[jkotas]

The codebase has been using mix of both names that just does not look great.

• PInvoke is the official name of the feature in public APIs and ECMA-335 spec.
• N/Direct name was likely inspired by J/Direct in the early days of .NET. We do not need to carry this legacy naming forward.

[AaronRobinsonMSFT]

/cc @dotnet/dotnet-diag

[AaronRobinsonMSFT]

Failures are #118246

[AaronRobinsonMSFT]