build-and-install: document FLB_MINIMAL and FLB_ALL_* options

[RaJiska]

Adds documentation for changes introduced in fluent/fluent-bit#12160, additionally add previously undocumented FLB_MINIMAL option.

Summary by CodeRabbit

• Documentation
  • Added documentation for build options that enable or disable filter, input, output, and processor plugin groups.
  • Documented the FLB_MINIMAL option for disabling all plugins.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 664778f6-ed98-4248-bbf5-7c778731642f

📥 Commits

Reviewing files that changed from the base of the PR and between 2180b7a and 4dcd9ce.

📒 Files selected for processing (1)

• installation/downloads/source/build-and-install.md

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📝 Walkthrough

Walkthrough

The build options documentation adds grouped CMake toggles for plugin categories and documents FLB_MINIMAL for disabling all plugins.

Changes

CMake Build Options

Layer / File(s)	Summary
Document plugin selection options installation/downloads/source/build-and-install.md	The build options table documents grouped filter, input, output, and processor toggles, plus the FLB_MINIMAL option.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: eschabell

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the added documentation for FLB_MINIMAL and FLB_ALL_* build options.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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