Align C FFI with overview

[andrzejressel]

Closes #896

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 152 lines in your changes missing coverage. Please review.

Project coverage is 48.73%. Comparing base (16a9d39) to head (38924ab).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/c_ffi/src/lib.rs	0.00%	152 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #922      +/-   ##
==========================================
- Coverage   49.17%   48.73%   -0.45%     
==========================================
  Files          63       63              
  Lines        8821     8901      +80     
==========================================
  Hits         4338     4338              
- Misses       4483     4563      +80     

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[Copilot]

PR Overview

This PR updates the Pulumi C FFI and example code to align with the new API overview. Key changes include:

• Adding a new function, get_array_as_string, to the common library for stack exports.
• Renaming and refactoring C FFI types and functions (e.g. replacing CustomRegisterOutputId with CustomCompositeOutputId and PulumiEngine with PulumiContext).
• Updating test cases and configuration (in C++ and Docker examples, as well as cbindgen.toml) to reflect the new naming and API structure.

Reviewed Changes

File	Description
examples/common/src/lib.rs	Added a new function to serialize an array from the stack export.
crates/c_ffi/src/lib.rs	Refactored types and functions to align with the new FFI design, including renaming and API changes.
crates/c_ffi/Cargo.toml	Removed unused workspace dependencies to match the updated design.
examples/cpp/tests/test.rs	Updated tests to use the new get_array_as_string and additional output assertions.
crates/c_ffi/cbindgen.toml	Updated exported names to reflect the new type names.
examples/docker/tests/test.rs	Modified tests to assert against repo_digest instead of remote_image_id.
examples/docker/src/lib.rs	Renamed export key from remote_image_id to repo_digest.

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

crates/c_ffi/src/lib.rs:189

• An unresolved FIXME remains in the invoke resource function, which may indicate incomplete output management. Consider addressing this issue to ensure proper handling.

    // inner_engine.outputs.push(raw); //FIXME

[Copilot]

There is an unresolved FIXME comment regarding output registration. Please either implement the necessary logic or remove the comment if it's no longer applicable.

Suggested change

	// inner_engine.outputs.push(raw); //FIXME
	inner_engine.outputs.push(output.native.clone());