The _make_config_values macro reduces duplication (both the item name
and the types need to be available as C++ identifiers and as runtime
strings), but is hard to work with. The macro is huge and editors
don't handle it well, errors aren't identified at the correct
location, and since the macro doesn't have types, it's hard to
refactor.
This series replaces the macro with ordinary C++ code. Some repetition is
introduced, but IMO the result is easier to maintain than the macro. As a
bonus the bulk of the code is moved away from the header file.
Tests: unit (dev), manual testing of the config REST API
* https://github.com/avikivity/scylla config-no-macro/v2
config: make the named_value type name available without requiring
_make_config_values
config: remove value_status from named_value template parameter list
config: add named_value::value_as_json()
api: config: stop using _make_config_values
config: auto-add named_values into config_file
config: add allowed_values parameter to named_value constructor
config: convert _make_config_values to individual named_value member
declarations and initializers
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