feat: use SSE in forc-publish for long-running uploads

[sdankel]

This pull request introduces changes to enhance the functionality of the forc-publish plugin, including improvements to error handling, support for streaming server responses, and updates to dependencies. The most significant changes include adding a new error variant, updating the upload method to handle streaming responses, and modifying dependencies to include futures-util and additional features for reqwest.

Enhancements to Error Handling:

• Added a new ServerError variant to the Error enum in forc-plugins/forc-publish/src/error.rs to handle server-related errors.

Improvements to upload Method:

• Updated the upload method in forc-publish/src/forc_pub_client.rs to process streaming server responses using futures-util::StreamExt. This includes handling chunked data, parsing JSON responses, and printing event updates. [1] [2]

Dependency Updates:

• Added futures-util as a dependency in Cargo.toml and forc-plugins/forc-publish/Cargo.toml to support streaming operations. [1] [2]
• Enabled the stream feature for reqwest in forc-plugins/forc-publish/Cargo.toml to facilitate streaming server responses.

Minor Adjustments:

• Added empty println! calls in main.rs to improve output formatting during error handling and publishing operations. [1] [2]