Fix the red CI on develop (json_view pointer tokens, bson, from_json tests, Infer, IWYU) (#5942)

* json_view: pointer tokens that cannot be array indices create objects

editable_document::set() chose an array for a null parent whenever the
token consisted of digits, so "01" threw parse_error.106 and the empty
token threw, while basic_json::operator[](json_pointer) has created an
object for such tokens since #5358. This broke
unit-json_view_edit_values on develop. Use the same RFC 6901 array index
test as basic_json.

Also re-indent the unflatten test that the astyle check flagged.

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

* Fix the other red jobs on develop

- unit-bson: initialize recorder::events in its declaration (-Weffc++)
- unit-json_view_from_json: suppress -Wexit-time-destructors for the
  serialize-enum tables and -Wfloat-equal for same()
- unit-pointer_access: @infer-ignore NULLPTR_DEREFERENCE for the
  dereferences after get_ptr() that Infer reports
- json_view.hpp: IWYU no_include for the detail headers that the view
  code uses through nlohmann/json.hpp

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

* Fix GCC warnings in the json_view from_json test

GCC (-Weffc++, -Wfloat-equal) rejected unit-json_view_from_json.cpp
(ci_test_standards_gcc (20)): initialize the members of shape and
with_names, and suppress -Wfloat-equal for GCC like for clang.

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

---------

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

tests/src/unit-bson.cpp

@@ -1311,7 +1311,7 @@ TEST_CASE("BSON declared document size bounds the content")
     // records the events that a SAX parser receives
     struct recorder : nlohmann::json_sax<json>
     {
-        std::string events;
+        std::string events{};
 
         bool null() override
         {