Generate output using Doxygen / Breathe (#598)

* Modify Doxygen config to pick up include directories recursively

* Add DeviceMem struct to API Reference guide

* Add classes that are used in Flash Attention kernel

* Add a reference and config for generating bibliography

Co-authored-by: Philip Maybank <Philip.Maybank@amd.com>

[ROCm/composable_kernel commit: e4bf6d422e]

docs/Doxyfile

@@ -775,8 +775,10 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = ../library/include \
-                         ../library/include/internal
+INPUT                  = ../include/ck/tensor_operation/gpu/grid \
+                         ../include/ck/tensor_operation/gpu/block \
+                         ../include/ck/tensor_operation/gpu/thread \
+                         ../library/include/ck/library/utility
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
@@ -845,7 +847,7 @@ FILE_PATTERNS          = *.c \
 # be searched for input files as well.
 # The default value is: NO.
 
-RECURSIVE              = NO
+RECURSIVE              = YES
 
 # The EXCLUDE tag can be used to specify files and/or directories that should be
 # excluded from the INPUT source files. This way you can easily exclude a