Inline stdin reader for AWS invoke commands

[GrahamCampbell]

No description provided.

[Copilot]

Pull request overview

This PR replaces the external get-stdin dependency with an internal stdin reader utility and updates AWS invoke paths/tests accordingly, reducing third-party surface area while keeping invoke/invoke-local behavior consistent.

Changes:

• Added lib/utils/get-stdin.js to read piped stdin (supports string/byte chunks, strips UTF-8 BOM, preserves multibyte correctness).
• Switched AWS invoke and invoke-local to use the internal utility instead of the get-stdin package.
• Added unit coverage for the new stdin utility and updated proxyquire paths in invoke-local tests; removed get-stdin from package.json.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lib/utils/get-stdin.js	Introduces internal async stdin reader used by invoke flows.
lib/plugins/aws/invoke.js	Replaces get-stdin dependency import with internal util.
lib/plugins/aws/invoke-local/index.js	Replaces get-stdin dependency import with internal util.
test/unit/lib/utils/get-stdin.test.js	Adds unit tests covering chunk types, BOM stripping, and error cases.
test/unit/lib/plugins/aws/invoke-local/index.test.js	Updates proxyquire stubs to match new require path.
package.json	Drops get-stdin from dependencies.

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