add http client

[Gaxeer]

Add http client, update dependencies

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces an HTTP client to the rust-utils library, along with a job system for handling asynchronous requests. It also includes necessary dependency updates and feature flags to manage the new functionality.

Class diagram for HTTP and Job System

classDiagram
    class RequestOptions {
        +Option~String~ output_filename
        +Option~String~ body_filename
    }

    class Response {
        +u16 status_code
        +HashMap~String,String~ headers
        +Option~str~ body
    }

    class RequestPrep {
        +Request req
        +Option~String~ output_filename
        +Vec~u8~ body
    }

    class Job {
        +Receiver~Output~ rx
        +JoinHandle handle
    }

    class Jobs {
        +HashMap~JobId,Job~ map
        +usize next_job
        +start()
        +check()
    }

    Jobs *-- Job
    note for Jobs "Manages async HTTP requests"

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File-Level Changes

Change	Details	Files
Added an HTTP client with support for synchronous and asynchronous requests.	Implemented http_request_blocking for synchronous requests. Implemented http_request_async for asynchronous requests using a job system. Added http_check_request to check the status of asynchronous requests. Added start_http_client and shutdown_http_client to manage the HTTP client lifecycle. Added a job system for managing asynchronous tasks. Added DM procs for calling the new HTTP functionality.	src/http.rs src/jobs.rs dmsrc/http.dm
Updated dependencies and added new ones for HTTP and async functionality.	Added ureq for HTTP client functionality. Added flume for the job system. Added once_cell for lazy initialization. Added serde and serde_json for serialization and deserialization. Updated the version of the crate. Added feature flags for http, jobs, and other dependencies.	Cargo.toml
Modified error handling to include new HTTP-related errors.	Added JsonSerialization error for serde_json errors. Added Request error for ureq errors.	src/error.rs
Modified file writing to return a Result instead of a BResult.	Changed the return type of the write function to use the new Result type alias.	src/file.rs
Added new modules to the library.	Added jobs module. Added http module.	src/lib.rs

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We've reviewed this pull request using the Sourcery rules engine.