Restore v3.12.0 support for custom object key types (#5795)

* Restore v3.12.0 support for custom object key types

Custom object_t types whose key_type is not string_t compiled with
v3.12.0 for several APIs that unreleased changes broke:

- to_bson failed for every custom key type (#5553 kept a const string_t*
  to the key); the nested entry's header is now written where the entry
  is found.
- Copying deep values (and parse, merge_patch, update, insert) required
  operator== on keys (#5389); keys without one are now paired via find().
- to_cbor/to_msgpack required an implicit conversion to string_t (#5746,
  #5328); keys without one go through a temporary basic_json again.
- at() required a conversion to string_t for its error message (#5727);
  other keys are passed to concat() unchanged again.

The new unit-custom-object-key-type.cpp covers five key types with
different capabilities.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Use the with_object_t alias for the custom object key test types

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Avoid floating-point equality in custom key type test

GCC with -Werror=float-equal rejects comparing the double value with ==.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Write the head of nested BSON elements in one helper

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Suppress bugprone-return-const-ref-from-parameter in key_for_message

The reference is only passed to concat() within the full-expression that
holds the key, like the similar helpers in binary_writer.hpp.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Make the value of the custom test key types private

clang-tidy (cppcoreguidelines-non-private-member-variables-in-classes)
rejects the protected member; the derived key types use a protected
accessor instead.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Pass keys with data() and size() unchanged into the at() miss message

key_for_message() converted every key that string_t can be constructed
from, so a miss on a string_t or string_view key copied it before
concat() copied it again. Keys that concat() can append through data()
and size() are now passed through; only other keys (string literals,
key types that just convert to string_t) are converted.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

---------

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

docs/mkdocs/docs/api/basic_json/object_t.md

@@ -26,8 +26,7 @@ To store objects in C++, a type is defined by the template parameters described
 
 `StringType`
 :   the type of the keys or names (e.g., `std::string`). The comparison function `std::less<StringType>` is used to
-    order elements inside the container. `object_t::key_type` must be implicitly convertible to `string_t` (required by the
-    binary formats).
+    order elements inside the container.
 
 `AllocatorType`
 :   the allocator to use for objects (e.g., `std::allocator`)