fix(fileutils): Add readBytesFromFile for use in Hybrid SDKs

[krystofwoldrich]

📜 Description

This PR moves readBytesFromFile from EnvelopeItem to FileUtils to share this code with Hybrid SDKs.

💡 Motivation and Context

• Profiling for RN sentry-react-native#2668

With this change, we avoid duplicate code in RN Java Module.

💚 How did you test it?

RN sample app

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	391.68 ms	466.00 ms	74.32 ms
Size	1.72 MiB	2.29 MiB	578.14 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
283d83e	348.44 ms	392.06 ms	43.62 ms
c7e2fbc	377.85 ms	426.35 ms	48.50 ms
93a76ca	391.54 ms	475.65 ms	84.11 ms
86f0096	371.86 ms	439.78 ms	67.92 ms
93a76ca	377.96 ms	447.52 ms	69.56 ms
c7e2fbc	398.35 ms	468.52 ms	70.17 ms
c3f503e	360.41 ms	434.67 ms	74.27 ms
a3c77bc	375.80 ms	445.85 ms	70.06 ms
99a51e2	405.11 ms	479.65 ms	74.54 ms
3d8bd2b	375.34 ms	446.32 ms	70.98 ms

App size

Revision	Plain	With Sentry	Diff
283d83e	1.72 MiB	2.29 MiB	577.69 KiB
c7e2fbc	1.72 MiB	2.29 MiB	576.40 KiB
93a76ca	1.72 MiB	2.29 MiB	576.75 KiB
86f0096	1.72 MiB	2.29 MiB	576.50 KiB
93a76ca	1.72 MiB	2.29 MiB	576.75 KiB
c7e2fbc	1.72 MiB	2.29 MiB	576.40 KiB
c3f503e	1.72 MiB	2.29 MiB	577.04 KiB
a3c77bc	1.72 MiB	2.29 MiB	577.53 KiB
99a51e2	1.72 MiB	2.29 MiB	576.34 KiB
3d8bd2b	1.72 MiB	2.29 MiB	577.53 KiB

Previous results on branch: kw-move-readbytes-to-fileutils

Startup times

Revision	Plain	With Sentry	Diff
6d9bd2b	355.53 ms	460.74 ms	105.21 ms
dc345fe	367.43 ms	453.78 ms	86.35 ms
3e6582d	375.41 ms	446.68 ms	71.27 ms

App size

Revision	Plain	With Sentry	Diff
6d9bd2b	1.72 MiB	2.29 MiB	578.13 KiB
dc345fe	1.72 MiB	2.29 MiB	578.14 KiB
3e6582d	1.72 MiB	2.29 MiB	578.14 KiB

[markushi]

Sweet!