fix(nestjs-tools-fastify-upload): implement temporary file handling and improve stream processing

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Description

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

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Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
79.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud