[libc][docs] Add glob implementation status doc and include in CMakeLists (llvm#126923)

These changes tracks `glob.h` for the implementation status of functions
and macros, with respect to the issue ( llvm#122006 ) .

cc @nickdesaulniers

Author: StarOne01

libc/docs/CMakeLists.txt

@@ -43,6 +43,7 @@ if (SPHINX_FOUND)
       errno
       fenv
       float
+      glob
       inttypes
       locale
       net/if

libc/docs/headers/index.rst

@@ -14,6 +14,7 @@ Implementation Status
    errno
    fenv
    float
+   glob
    inttypes
    locale
    math/index.rst

libc/utils/docgen/glob.yaml

@@ -0,0 +1,28 @@
+macros:
+  GLOB_APPEND:
+    in-latest-posix: ''
+  GLOB_DOOFFS:
+    in-latest-posix: ''
+  GLOB_ERR:
+    in-latest-posix: ''
+  GLOB_MARK:
+    in-latest-posix: ''
+  GLOB_NOCHECK:
+    in-latest-posix: ''
+  GLOB_NOESCAPE:
+    in-latest-posix: ''
+  GLOB_NOSORT:
+    in-latest-posix: ''
+  GLOB_ABORTED:
+    in-latest-posix: ''
+  GLOB_NOMATCH:
+    in-latest-posix: ''
+  GLOB_NOSPACE:
+    in-latest-posix: ''
+
+functions:
+  glob:
+    in-latest-posix: ''
+  globfree:
+    in-latest-posix: ''
+