[libc++][format] Adds bool formatter.

Implements the formatter for Boolean types.
[format.formatter.spec]/2.3
For each charT, for each cv-unqualified arithmetic type ArithmeticT other
than char, wchar_t, char8_t, char16_t, or char32_t, a specialization
```
  template<> struct formatter<ArithmeticT, charT>;
```
This removes the stub implemented in D96664.

Implements parts of:
- P0645 Text Formatting
- P1652 Printf corner cases in std::format

Completes:
- P1868 width: clarifying units of width and precision in std::format

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D103670

NOKEYCHECK=True
GitOrigin-RevId: 7fb9f99f3bb645337b4f4e6a2a3515219be82011
diff --git a/include/module.modulemap b/include/module.modulemap
index 4f10773..5abe243 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -450,6 +450,7 @@
       module format_parse_context   { private header "__format/format_parse_context.h"   }
       module format_string          { private header "__format/format_string.h"          }
       module formatter              { private header "__format/formatter.h"              }
+      module formatter_bool         { private header "__format/formatter_bool.h"         }
       module formatter_char         { private header "__format/formatter_char.h"         }
       module formatter_integer      { private header "__format/formatter_integer.h"      }
       module formatter_integral     { private header "__format/formatter_integral.h"     }