refactor: move native SDK init and close to SentryNativeBinding

[vaind]

📜 Description

Moves initNativeSDK() and close() out of the integration to the binding. This way, then can be overloaded/implemented in a platform-specific way - e.g. a different call for cocoa and for java.

💡 Motivation and Context

• extracted out of WIP: Flutter replay #2011
• #skip-changelog

I've needed to make this change in order to set up native bindings in the right order for JNI. While we won't have JNI interop right now, I'd still prefer to land these changes so they're in place for the future and don't need to be done again.

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[github-actions]

Android Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	379.19 ms	452.49 ms	73.30 ms
Size	6.33 MiB	7.29 MiB	987.32 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
d53c6fa	282.83 ms	344.00 ms	61.17 ms
ef31c7f	311.39 ms	359.33 ms	47.94 ms
eecbbca	324.37 ms	352.49 ms	28.12 ms
48adddf	353.96 ms	431.10 ms	77.14 ms
b0811cc	580.00 ms	675.69 ms	95.69 ms
89ea268	320.35 ms	377.68 ms	57.33 ms
ccc09e4	308.21 ms	357.74 ms	49.54 ms
d089990	361.67 ms	442.50 ms	80.83 ms
2331d89	352.45 ms	417.34 ms	64.89 ms
1a93825	347.31 ms	424.54 ms	77.23 ms

App size

Revision	Plain	With Sentry	Diff
d53c6fa	6.16 MiB	7.14 MiB	1011.18 KiB
ef31c7f	6.06 MiB	7.09 MiB	1.03 MiB
eecbbca	5.94 MiB	6.89 MiB	975.78 KiB
48adddf	6.27 MiB	7.20 MiB	959.09 KiB
b0811cc	6.33 MiB	7.27 MiB	954.02 KiB
89ea268	6.06 MiB	7.03 MiB	989.24 KiB
ccc09e4	5.94 MiB	6.95 MiB	1.01 MiB
d089990	6.34 MiB	7.28 MiB	967.79 KiB
2331d89	5.94 MiB	6.96 MiB	1.02 MiB
1a93825	6.27 MiB	7.20 MiB	956.36 KiB

[github-actions]

iOS Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1244.40 ms	1260.18 ms	15.78 ms
Size	8.32 MiB	9.50 MiB	1.18 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
25e9b59	1289.76 ms	1295.27 ms	5.51 ms
6fedcab	1242.33 ms	1269.66 ms	27.33 ms
f275487	1291.65 ms	1339.92 ms	48.26 ms
559d28f	1265.04 ms	1288.96 ms	23.92 ms
56810ff	1267.59 ms	1293.48 ms	25.89 ms
746a779	1227.06 ms	1243.53 ms	16.47 ms
7ade5af	1296.24 ms	1297.43 ms	1.18 ms
aa950e9	1275.17 ms	1295.33 ms	20.16 ms
26e955b	1232.35 ms	1258.88 ms	26.52 ms
6078ddc	1207.84 ms	1224.10 ms	16.27 ms

App size

Revision	Plain	With Sentry	Diff
25e9b59	8.16 MiB	9.15 MiB	1021.15 KiB
6fedcab	8.32 MiB	9.50 MiB	1.18 MiB
f275487	8.32 MiB	9.38 MiB	1.05 MiB
559d28f	8.15 MiB	9.12 MiB	987.32 KiB
56810ff	8.15 MiB	9.12 MiB	987.35 KiB
746a779	8.28 MiB	9.33 MiB	1.05 MiB
7ade5af	8.15 MiB	9.15 MiB	1015.93 KiB
aa950e9	8.16 MiB	9.17 MiB	1.01 MiB
26e955b	8.28 MiB	9.34 MiB	1.05 MiB
6078ddc	8.33 MiB	9.40 MiB	1.07 MiB