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test: cover port implementations with unit tests

The commit introduces new `unit/port.cc` test that covers almost all
port implementations and almost all port methods. This test was
intended as a testing point for future port changes.

Implementations `port_sql` and `port_vdbemem` and method  `dump_vdbemem`
are not tested because I don't know much about the sql subsystem. For
the same reason, I didn't tested `port_dump_msgpack_with_context`.
Method `dump_msgpack_16` is not actually supported, but it is
still used for compatibility with very old connectors. The problem is I
found a bug in `port_c_dump_msgpack_16` while writing the test, and we
don't want to fix it - probably, we will get rid of this method in
future. Method `dump_plain` is not tested because it requires functions
from `console.lua` file - it is easier to test `console.push` from Lua
then loading the Lua file in unit test.

The file has .cc extension because the test requires user_cache
susbystem, which has init and free methods available only from C++
source files.

NO_CHANGELOG=test
NO_DOC=test

66966 of 119368 branches covered (56.1%)

99457 of 114369 relevant lines covered (86.96%)

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