feat(websocket): propagate esp_tls stack error and cert verify flags

[johanstokking]

Even though the esp_tls_stack_err and esp_tls_cert_verify_flags are get, they are not propagated through event data. This fixes that.

I came across this because I noticed that an Mbed TLS error code that I was interested in (MBEDTLS_ERR_SSL_ALLOC_FAILED) was correctly logged by the component, but esp_tls_stack_err was uninitialized.

[david-cermak]

Thanks for fixing this issue!

These errors are even used(!) in examples, referring and printing some old/invalid values.