Add a configure chapter to the socket usage guide

[bmk]

Add a chapter to the socket usage guide, describing all the 'socket' configure options.

[github-actions]

CT Test Results

    2 files     70 suites   1h 7m 46s ⏱️
1 567 tests 1 324 ✅ 242 💤 1 ❌
1 818 runs  1 524 ✅ 293 💤 1 ❌

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Results for commit d72db9c.

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[IngelaAndin]

As it is a user guide maybe it would be motivated to hint what the tradeoffs are for all the options even if some of them feel more obvious ?!

[IngelaAndin]

@bmk In the table where you reference RCVTIMEO/SNDTIMEO you have "see below " references, I think that is only confusing.
I would suggest writing something along the lines

"Is not supported by default. If support is wanted it has to be enabled at build time with the configure flags ... , however we recommend using other means of timeouts, for instance ... , as these timeouts may cause unwanted behavior when used in an asynchronous message handling environment as our socket API"