The memory allocated by golang lib c-polygonid should be freed.

[yushihang]

reference: 0xPolygonID/c-polygonid#72

Pull request here: #390

1. iOS & Android libs are built based on this Pull Request in c-polygonid repo: add PLGNFreeCString(str *C.char) to free the memory allocated by Golang using C.CString() c-polygonid#73
2. Add PLGNFreeCString() call in flutter/dart code

[yushihang]

• During previous testing, we found that repeatedly executing the fetchAndSaveClaims() function causes the app's memory usage to continuously increase.

• After using the Instruments tool in Xcode for profiling, it was found that after about 88 calls to fetchAndSaveClaims(), the app's memory usage reached around 3.5G, and was killed by iOS system.

• After applying the following PRs for bugfix, continuous calls of over a hundred fetchAndSaveClaims() now maintain a stable memory usage (below 100M).

  • free memory allocated by Golang using C.CString() #390
  • free ffi allocated memory using malloc.free() #386
  • add PLGNFreeCString(str *C.char) to free the memory allocated by Golang using C.CString() c-polygonid#73
  • Add a destructor for struct Circom_Circuit to release dynamically allocated memory and prevent memory leaks. witnesscalc#22

[github-actions]

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