json_view: source positions in materialize() with JSON_DIAGNOSTIC_POSITIONS

With JSON_DIAGNOSTIC_POSITIONS, materialize() now gives every value the
start_pos()/end_pos() that basic_json::parse() would give it, so exceptions
about materialized values name the same bytes (#5864).

- json_sax_dom_parser takes the lexer type as a defaulted template
  parameter; materialize() passes position_source, which reports the
  positions it derives from the index. diagnostic_positions treats npos as
  "no position" and keeps ranges all-or-nothing.
- Strings with escapes keep the offset of their opening quote plus one in
  `next` (only with the macro); materialize() scans from there to the closing
  quote. The end of an array or object is found by scanning from the end of
  its last element over whitespace, comments and a trailing comma.
- In editable documents, values written by edits, arrays and objects whose
  elements changed, and containers whose last element has no position get
  none. Images keep the flag is_new, and load() checks that `next` of a
  string is within the text.

Nothing changes on the parse path without the macro. The view's own
exceptions still carry no byte range, so the tests that compare them with
those of materialized values skip it under the macro, as they skip the path
under JSON_DIAGNOSTICS.

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

include/nlohmann/detail/view/node.hpp

@@ -69,7 +69,7 @@ struct node
     std::uint16_t extra; ///< numbers: integer digits (low byte) and fraction digits (high byte), 255 = "many"; objects: number of the object's key hash index (1-based, 0 = none); otherwise 0
     std::uint32_t off;   ///< source offset (string content, number token, literal, bracket); arena offset if escaped/edited; number of the element sequence if moved
     std::uint32_t len;   ///< string: decoded bytes; float: token bytes; array/object: element count
-    std::uint32_t next;  ///< array/object: number of nodes of the subtree (its extent in the enclosing sequence)
+    std::uint32_t next;  ///< array/object: number of nodes of the subtree (its extent in the enclosing sequence); escaped string: source offset of the opening quote plus one (JSON_DIAGNOSTIC_POSITIONS; 0: unknown)
 };
 static_assert(sizeof(node) == 16, "node must stay 16 bytes");