fix: add NSNull handling to sentry_sanitize

[philprime]

📜 Description

• Adds handling of [NSNull null] as parameter for sentry_sanitize
• Adds unit tests for sentry_sanitize

💡 Motivation and Context

Closes #4748

💚 How did you test it?

• Additional unit tests

📝 Checklist

You have to check all boxes before merging:

• 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

none

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.220%. Comparing base (1d128a6) to head (6eb4fe0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4760       +/-   ##
=============================================
+ Coverage   91.077%   91.220%   +0.142%     
=============================================
  Files          622       625        +3     
  Lines        72360     72654      +294     
  Branches     25643     26459      +816     
=============================================
+ Hits         65904     66275      +371     
+ Misses        6362      6281       -81     
- Partials        94        98        +4     

Files with missing lines	Coverage Δ
Sources/Sentry/SentryNSDictionarySanitize.m	100.000% <100.000%> (ø)
...ests/Categories/SentryNSDictionarySanitize+Tests.m	100.000% <100.000%> (ø)
...s/Categories/SentryNSDictionarySanitizeTests.swift	100.000% <100.000%> (ø)

... and 48 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1d128a6...6eb4fe0. Read the comment docs.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1232.80 ms	1248.02 ms	15.22 ms
Size	22.31 KiB	775.27 KiB	752.96 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
077e940	1218.33 ms	1243.24 ms	24.92 ms
f1ed6f8	1210.94 ms	1230.78 ms	19.84 ms
1f9387b	1229.25 ms	1242.62 ms	13.37 ms
35647ef	1250.42 ms	1251.87 ms	1.46 ms
b9a9ffd	1221.18 ms	1235.37 ms	14.19 ms
0001a09	1223.90 ms	1249.56 ms	25.66 ms
add9550	1221.20 ms	1250.04 ms	28.84 ms
c0b4b71	1246.98 ms	1256.77 ms	9.79 ms
061c982	1226.33 ms	1243.65 ms	17.33 ms
86e9bf2	1225.70 ms	1252.19 ms	26.49 ms

App size

Revision	Plain	With Sentry	Diff
077e940	21.58 KiB	706.97 KiB	685.39 KiB
f1ed6f8	21.58 KiB	683.51 KiB	661.93 KiB
1f9387b	21.58 KiB	654.26 KiB	632.68 KiB
35647ef	21.58 KiB	706.97 KiB	685.39 KiB
b9a9ffd	21.58 KiB	418.43 KiB	396.85 KiB
0001a09	20.76 KiB	433.19 KiB	412.43 KiB
add9550	21.58 KiB	418.37 KiB	396.79 KiB
c0b4b71	20.76 KiB	430.98 KiB	410.22 KiB
061c982	21.58 KiB	683.51 KiB	661.93 KiB
86e9bf2	22.31 KiB	758.78 KiB	736.47 KiB

Previous results on branch: issue-4748-null-check

Startup times

Revision	Plain	With Sentry	Diff
e06c5b8	1226.11 ms	1247.77 ms	21.66 ms
f29efb5	1238.69 ms	1255.90 ms	17.20 ms

App size

Revision	Plain	With Sentry	Diff
e06c5b8	22.31 KiB	775.27 KiB	752.95 KiB
f29efb5	22.31 KiB	775.37 KiB	753.06 KiB

[armcknight]

Thanks for adding all the tests for this function!

[philipphofmann]

LGTM, when the tests are included in Xcode.