[libc++][format] Implements string escaping.

Implements parts of
- P2286R8 Formatting Ranges

Reviewed By: #libc, tahonermann

Differential Revision: https://reviews.llvm.org/D134036

libcxx/docs/Status/Cxx2bPapers.csv

@@ -62,7 +62,7 @@
 "`P2093R14 <https://wg21.link/P2093R14>`__","LWG","Formatted output","July 2022","",""
 "`P2165R4 <https://wg21.link/P2165R4>`__","LWG","Compatibility between ``tuple``, ``pair`` and ``tuple-like`` objects","July 2022","",""
 "`P2278R4 <https://wg21.link/P2278R4>`__","LWG","``cbegin`` should always return a constant iterator","July 2022","",""
-"`P2286R8 <https://wg21.link/P2286R8>`__","LWG","Formatting Ranges","July 2022","",""
+"`P2286R8 <https://wg21.link/P2286R8>`__","LWG","Formatting Ranges","July 2022","|Partial|",""
 "`P2291R3 <https://wg21.link/P2291R3>`__","LWG","Add Constexpr Modifiers to Functions ``to_chars`` and ``from_chars`` for Integral Types in ``<charconv>`` Header","July 2022","|Complete|","16.0"
 "`P2302R4 <https://wg21.link/P2302R4>`__","LWG","``std::ranges::contains``","July 2022","",""
 "`P2322R6 <https://wg21.link/P2322R6>`__","LWG","``ranges::fold``","July 2022","",""

libcxx/docs/Status/FormatPaper.csv

@@ -29,7 +29,7 @@ Section,Description,Dependencies,Assignee,Status,First released version
 `[time.syn] <https://wg21.link/time.syn>`_,"Formatter ``chrono::zoned_time<Duration, TimeZonePtr>``",A ``<chrono>`` implementation,Not assigned,,
 `P2286R8 <https://wg21.link/P2286R8>`__,"Formatting ranges"
 `[format.syn] <https://wg21.link/format.syn>`_,"Concept ``formattable``",,Mark de Wever,|Complete|, Clang 16
-`[format.string.std] <https://wg21.link/format.string.std>`_,"std-format-spec ``type`` debug",,Mark de Wever,|In Progress|,
+`[format.string.std] <https://wg21.link/format.string.std>`_,"std-format-spec ``type`` debug",,Mark de Wever,|Complete|,Clang 16
 `[format.range] <https://wg21.link/format.range>`_,"Formatting for ranges: sequences",,Mark de Wever,|In Progress|,
 `[format.range] <https://wg21.link/format.range>`_,"Formatting for ranges: associative",,Mark de Wever,,
 `[format.range] <https://wg21.link/format.range>`_,"Formatting for ranges: container adaptors",,Mark de Wever,,

libcxx/include/CMakeLists.txt

@@ -288,6 +288,7 @@ set(files
   __format/buffer.h
   __format/concepts.h
   __format/enable_insertable.h
+  __format/escaped_output_table.h
   __format/extended_grapheme_cluster_table.h
   __format/format_arg.h
   __format/format_arg_store.h