made http status code to i64

[raphael-goetz]

Resolves: #149

[Copilot]

Pull request overview

This PR addresses Issue #149 by allowing http::response::create to accept an integer HTTP status code (instead of a string), aligning runtime argument parsing with how numeric literals are represented.

Changes:

• Update http::response::create to take http_status_code as i64 and store it directly as a numeric status_code.
• Add TryFromArgument for i64 so runtime functions can request i64-typed parameters.
• Update flow fixtures to pass http_status_code as a numberValue.integer instead of a stringValue.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
flows/01_return_object.json	Updates http_status_code literal from string to numeric integer in the test flow.
flows/02_return_flow_input.json	Updates http_status_code literal from string to numeric integer in the test flow.
crates/core/src/runtime/functions/http.rs	Changes http::response::create to accept an i64 status code and emit it as a numeric value.
crates/core/src/context/argument.rs	Adds TryFromArgument support for extracting i64 from NumberValue.

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