Change it so that the header files are directly included

[AustinBenoit]

Description

Provide details of the change, and generalize the change in the PR title above.

Change it so that the header files are directly included

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Testing

Describe how you've tested these changes. Link any manually triggered Integration tests or CPP binary SDK Packaging Github Action workflows, if applicable.

Run all integration tests in github

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Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

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Notes

• Bug fixes and feature changes require an update to the Release Notes section of release_build_files/readme.md.
• Read the contribution guidelines CONTRIBUTING.md.
• Changes to the public API require an internal API review. If you'd like to help us make Firebase APIs better, please propose your change in a feature request so that we can discuss it together.

[gemini-code-assist]

Code Review

This pull request removes the automatic global inclusion of headers like assert.h, string.h, and stdint.h from CMakeLists.txt files across various modules, replacing them with explicit #include statements in the individual source and header files. The reviewer feedback recommends two main improvements: first, reordering includes so that companion headers are always included first (consistent with the Google C++ Style Guide); second, preferring C++ standard library headers (such as , , and ) over their C-style counterparts (like <assert.h>, <stdint.h>, and <string.h>) to ensure consistency and proper namespace scoping.