docs(native): Add documentation for REST-based remote functions

[Joe-Abraham]

Description

Add documentation for REST-based remote functions

Impact

NA

Test Plan

NA

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Release Notes

== NO RELEASE NOTE ==

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR extends the Presto documentation by adding comprehensive coverage for REST-based remote functions, including an overview, detailed syntax and configuration parameters, and practical usage examples—all integrated into the features.rst guide.

File-Level Changes

Change	Details	Files
Introduce REST-based remote functions feature	Added a new section outlining the concept and benefits of REST-based remote functions Explained prerequisites and high-level workflow for invoking remote HTTP endpoints	presto-docs/src/main/sphinx/presto_cpp/features.rst
Document syntax and configuration parameters	Defined SQL syntax for declaring REST-based remote functions Listed and described new configuration properties (endpoint URL, HTTP method, SSL settings, headers) Clarified default values and optional vs. required parameters	presto-docs/src/main/sphinx/presto_cpp/features.rst
Add practical examples and usage notes	Provided example remote function definitions and sample HTTP request/response snippets Included notes on error handling and authentication header usage	presto-docs/src/main/sphinx/presto_cpp/features.rst

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[Joe-Abraham]

@sourcery-ai review

[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[steveburnett]

Thanks for the documentation! I'll wait to review this until it's out of Draft mode.

[steveburnett]

Thanks for the documentation! This is really well-done: good organization, useful examples, and clear instructions on how to configure. A few minor nits of formatting and phrasing but overall very good. Thanks!

[steveburnett]

LGTM! (docs)

Pull updated branch, new local doc build. Thanks for the update!