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core: increase error logging verbosity from C

When compat option `box_error_serialize_verbose` is set to `new` then
`tostring` of Lua box error object prints error with increased
verbosity. This affects logging error from Lua. Unfortunately it does
not affect logging box error from C.

Let's move `tostring` logic to C code so we can align logging from Lua and
C.

Note that:

- error is logged from C verbosly unconditionally
  (`box_error_serialize_verbose` is not taken into account)
- details that printed before ':' are removed (error code for
  `ClientError` for example)

While at it we did next changes in `tostring()`:

- frames are printed from effect to cause
- prefix `Caused by: ` is added for cause frames

Note that `say_logger_free()` it patched so that logger can be
reinitialized in `unit/fiber.cc` test.

Closes #10116
Follow-up #9105

NO_DOC=minor change

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