unknown extension support in wc_PKCS7_EcdsaVerify

[anhu]

Allow user to prevent wc_PKCS7_EcdsaVerify from erroring out due to extensions we do not know about

[devin-ai-integration]

🛟 Devin Lifeguard found 1 likely issues in this PR

• check-all-return-codes snippet: Capture the return value of wc_SetUnknownExtCallback (e.g., ret = wc_SetUnknownExtCallback(dCert, pkcs7->unknownExtCallback);) and handle any non-zero error by propagating or processing it before continuing.

@anhu
please take a look at the above issues which Devin flagged. Devin will not fix these issues automatically.

[anhu]

Devin's comment is invalid. That function returns void.