Add wolfSSL debug messages

[gojimmypi]

Description

The PR adds debug messages in various functions, mostly surrounding more informative failures.

I found these useful while troubleshooting memory-constrained devices. It's particularly helpful to see the sizes of heap allocation attempts.

Of particular interest is wolfSSL_new XMALLOC and the subsequent check of InitSSL() for positive return values. I didn't actually see any. They probably don't even occur. Still...

There's otherwise some tidying up and other minor changes.

Fixes zd# n/a

Testing

How did you test?

Tested in Espressif environment and

./configure --enable-all
make clean
make && make test

I did see a failure for this:

FAIL: testsuite/testsuite.test

But the exact same failure also occurs with a fresh clone of wolfssl.

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

[SparkiDev]

Don't want the debug to become too noisy.
That is, only put out debug statements on error or long operations or when required to debug why an error is happening.

[gojimmypi]

Don't want the debug to become too noisy.

Agreed. I removed some of the messages that were only breadcrumbs without any real value.

I hadn't intended this to be such a big code review, but I appreciate your time. I hope this update addresses all of your suggestions. All were completely valid. Thank you.

[SparkiDev]

Thanks for all the changes!