docs(native): Add documentation for Presto C++ Installation

[saurabhmahawar]

Description

Added new documentation explaining how to use the Presto C++ engine.
The documentation provides step-by-step instructions for building, configuring, and running the Presto C++ worker##

Motivation and Context

There was no consolidated or beginner-friendly documentation for Presto C++ in the open-source project.
Users often had difficulty understanding how to build and run the C++ worker, what dependencies were required, and how it integrates with a Presto coordinator.

Impact

There is no performance impact.

Test Plan

Contributor checklist

• Please make sure your submission complies with our contributing guide, in particular code style and commit standards.
• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
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• Adequate tests were added if applicable.
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Release Notes

== NO RELEASE NOTE ==

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds new Sphinx documentation describing how to install and run the Presto C++ worker, including build, configuration, and integration steps, by introducing a dedicated installation guide and wiring it into the existing Presto C++ docs hierarchy.

File-Level Changes

Change	Details	Files
Introduce a dedicated installation guide for the Presto C++ worker.	Create a new Sphinx documentation page focused on installing and configuring the Presto C++ worker Document prerequisites and dependencies required to build the C++ engine Provide step-by-step instructions for building the worker from source and configuring it to connect to a Presto coordinator Describe how to start and validate a running C++ worker instance	presto-docs/src/main/sphinx/presto_cpp/installation.rst
Wire the new installation guide into the existing Presto C++ documentation structure.	Update the main Presto C++ documentation index to reference the new installation guide Ensure the new page participates in the Sphinx TOC so it appears in the rendered docs navigation	presto-docs/src/main/sphinx/presto-cpp.rst

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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: saurabhmahawar / name: Saurabh Mahawar (4a14b2d)

[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• Since you’ve moved content under presto_cpp/installation.rst, make sure presto-cpp.rst (and any relevant toctrees) links to this new doc so it’s discoverable from the main navigation.
• Check for any existing references or deep links to presto-cpp.rst that should now point to the new presto_cpp/installation.rst path to avoid broken links in the published docs.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since you’ve moved content under `presto_cpp/installation.rst`, make sure `presto-cpp.rst` (and any relevant toctrees) links to this new doc so it’s discoverable from the main navigation.
- Check for any existing references or deep links to `presto-cpp.rst` that should now point to the new `presto_cpp/installation.rst` path to avoid broken links in the published docs.

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