feat(api) new function: set hostname

[airween]

what

This PR adds a new feature which creates and sets the inside m_requestHostName variable, what used to fill the [hostname] in the log.

The PR provides a new API method: Transaction::setHostName(const std::string& hostname). If the method is not called during the transaction, then the variable contains the server IP address (no changes). Only the application controls this method.

There is a C function too: msc_set_request_hostname(const unsigned char * hostname);

why

Currently, [hostname] contains the IP address of the server, which is not useful at all.

references

See discussion #3200.

[sonarcloud]

Quality Gate failed

Failed conditions
C Maintainability Rating on New Code (required ≥ A)

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