Adding write capabilities and SetOtherNotificationFlags cDAC API

[rcj1]

• This PR implements the Write and WriteBuffer methods to write an arbitrary value/buffer respsectively to the data target in the cDAC.
• Added a unit test to test writing.
• Implemented SetOtherNotificationFlags cDAC API which requires writing.

[Copilot]

Pull Request Overview

This PR implements write capabilities and the SetOtherNotificationFlags cDAC API by adding write methods to the data contract reader framework and implementing a specific notification flags API that requires write access.

Key changes:

• Added Write and WriteBuffer methods to the Target abstraction and ContractDescriptorTarget implementation
• Implemented SetOtherNotificationFlags cDAC API with proper validation and write functionality
• Enhanced mock testing infrastructure to support write operations

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Abstractions/Target.cs	Added abstract Write and WriteBuffer method declarations to the Target base class
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader/ContractDescriptorTarget.cs	Implemented write methods, added WriteToTargetDelegate, and refactored to use DataTargetDelegates
src/native/managed/cdac/mscordaccore_universal/Legacy/SOSDacImpl.IXCLRDataProcess.cs	Implemented SetOtherNotificationFlags method with validation and write operations
src/native/managed/cdac/mscordaccore_universal/Legacy/ISOSDacInterface.cs	Added CLRDataOtherNotifyFlag enum for notification flag constants
src/native/managed/cdac/mscordaccore_universal/Entrypoints.cs	Updated entry points to accept and use write delegate function pointers
src/coreclr/debug/daccess/cdac.cpp	Added WriteToTargetCallback function and updated initialization call
src/native/managed/cdac/inc/cdac_reader.h	Updated function signature to include write_to_target parameter
src/native/managed/cdac/tests/MockMemorySpace.cs	Added WriteContext class with WriteToTarget implementation for testing
src/native/managed/cdac/tests/ContractDescriptor/ContractDescriptorBuilder.cs	Updated to use both read and write contexts for target creation
src/native/managed/cdac/tests/ContractDescriptor/TargetTests.cs	Added WriteValue test to verify write functionality
src/native/managed/cdac/tests/TestPlaceholderTarget.cs	Added WriteBuffer and Write method stubs that throw NotImplementedException
src/tools/StressLogAnalyzer/src/Program.cs	Added write delegate that throws NotImplementedException for read-only tool

[dotnet-policy-service]

Tagging subscribers to this area: @steveisok, @dotnet/dotnet-diag
See info in area-owners.md if you want to be subscribed.

[max-charlamb]

Have you tested this API on a dump (where the write should fail)? We should verify that the failure happens in a handeled and expected way.

[rcj1]

Have you tested this API on a dump (where the write should fail)? We should verify that the failure happens in a handeled and expected way.

I'm working on it

[rcj1]

Have you tested this API on a dump (where the write should fail)? We should verify that the failure happens in a handeled and expected way.

The cDAC behavior matches that of the DAC; Windbg allows writes to dumps, while dotnet-dump does not (quiet failure from the end user's perspective).

[max-charlamb]

left a couple of comments, but generally looks good to me