fix(device): Fix ANR when collecting device context

[romtsn]

📜 Description

• Make external storage size collection an opt-in (note added to the changelog)
• For internal storage use Environment.getDataDirectory() which gives path to /data and still allows querying global stats for the internal storage + does not call the blocking context.getFilesDir API

💡 Motivation and Context

Closes #4963

💚 How did you test it?

Manually, see this event with the storage size data: https://sentry-sdks.sentry.io/issues/7033512048/events/9ee5087ef915441caf9bdd38bacaa245/

📝 Checklist

• I added GH Issue ID & Linear ID
• 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.
• I updated the wizard 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	334.26 ms	419.52 ms	85.26 ms
Size	1.58 MiB	2.13 MiB	559.54 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
5b66efd	308.67 ms	363.85 ms	55.18 ms
fc5ccaf	322.49 ms	405.25 ms	82.76 ms
6405ec5	310.88 ms	354.56 ms	43.69 ms
d364ace	382.77 ms	443.21 ms	60.44 ms
bbc35bb	298.53 ms	372.17 ms	73.64 ms
3d205d0	352.15 ms	432.53 ms	80.38 ms
539ca63	313.51 ms	355.43 ms	41.92 ms
dba088c	365.46 ms	366.31 ms	0.85 ms
fc5ccaf	270.49 ms	363.90 ms	93.41 ms
fcec2f2	328.91 ms	387.75 ms	58.84 ms

App size

Revision	Plain	With Sentry	Diff
5b66efd	1.58 MiB	2.13 MiB	559.07 KiB
fc5ccaf	1.58 MiB	2.13 MiB	557.54 KiB
6405ec5	1.58 MiB	2.12 MiB	552.23 KiB
d364ace	1.58 MiB	2.11 MiB	539.75 KiB
bbc35bb	1.58 MiB	2.12 MiB	553.01 KiB
3d205d0	1.58 MiB	2.10 MiB	532.97 KiB
539ca63	1.58 MiB	2.12 MiB	551.41 KiB
dba088c	1.58 MiB	2.13 MiB	558.99 KiB
fc5ccaf	1.58 MiB	2.13 MiB	557.54 KiB
fcec2f2	1.58 MiB	2.12 MiB	551.50 KiB

Previous results on branch: rz/fix/external-files-dir-optin

Startup times

Revision	Plain	With Sentry	Diff
d9f1134	302.17 ms	356.53 ms	54.36 ms

App size

Revision	Plain	With Sentry	Diff
d9f1134	1.58 MiB	2.13 MiB	559.54 KiB

[markushi]

LGTM, but I think one test needs fixing.