[libc++][doc] Adds a Format library status page.

A status page for libc++'s Format library. The page is inspired by
@zoecarver's Ranges status page.

Differential Revision: https://reviews.llvm.org/D101085

GitOrigin-RevId: ca177dcda301b98b73c67a2cbcbd4106dc80dec2
diff --git a/docs/FormatIssuePaperStatus.csv b/docs/FormatIssuePaperStatus.csv
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+Number,Name,Assignee,Patch,Status,First released version
+`P0645 <https://wg21.link/P0645>`_,"Text Formatting",Mark de Wever,,|partial|,
+`P1652 <https://wg21.link/P1652>`_,"Printf corner cases in std::format",,,,
+`P1892 <https://wg21.link/P1892>`_,"Extended locale-specific presentation specifiers for std::format",,,,
+`P1862 <https://wg21.link/P1862>`_,"width: clarifying units of width and precision in std::format (Implements the unicode support.)",,,,
+`LWG-3218 <https://wg21.link/LWG3218>`_,"Modifier for %d parse flag does not match POSIX and format specification",,,,
+`LWG-3242 <https://wg21.link/LWG3242>`_,"std::format: missing rules for arg-id in width and precision",,,,
+`LWG-3243 <https://wg21.link/LWG3243>`_,"std::format and negative zeroes",,,,
+`LWG-3246 <https://wg21.link/LWG3246>`_,"What are the constraints on the template parameter of basic_format_arg?",,,,
+`LWG-3248 <https://wg21.link/LWG3248>`_,"std::format #b, #B, #o, #x , and #X presentation types misformat negative numbers",,,,
+`LWG-3250 <https://wg21.link/LWG3250>`_,"std::format: # (alternate form) for NaN and inf",,,,
+`LWG-3327 <https://wg21.link/LWG3327>`_,"Format alignment specifiers vs. text direction",,,,
+`LWG-3340 <https://wg21.link/LWG3340>`_,"Formatting functions should throw on argument/format string mismatch in [format.functions]",,,,
+`LWG-3371 <https://wg21.link/LWG3371>`_,"visit_format_arg and make_format_args are not hidden friends",Mark de Wever,`D93593 <https://llvm.org/D93593>`__,Review,
+`LWG-3372 <https://wg21.link/LWG3372>`_,"vformat_to should not try to deduce Out twice",,,,
+`LWG-3373 <https://wg21.link/LWG3373>`_,"{to,from}_chars_result and format_to_n_result need the 'we really mean what we say'",,,,
+
+`P1361 <https://wg21.link/P1361>`_,"Integration of chrono with text formatting",,,,
+`LWG-3230 <https://wg21.link/LWG3230>`_,"Format specifier %y/%Y is missing locale alternative versions",,,,
+`LWG-3241 <https://wg21.link/LWG3241>`_,"chrono-spec grammar ambiguity in [time.format]",,,,
+`LWG-3262 <https://wg21.link/LWG3262>`_,"Formatting of negative durations is not specified",,,,
+`LWG-3270 <https://wg21.link/LWG3270>`_,"Parsing and formatting %j with durations",,,,
+`LWG-3272 <https://wg21.link/LWG3272>`_,"%I%p should parse/format duration since midnight",,,,
+`LWG-3332 <https://wg21.link/LWG3332>`_,"Issue in [time.format]",,,,