Adds some profiling keybinding under `SPC h P`

doc/DOCUMENTATION.org

@@ -1851,6 +1851,16 @@ Other help key bindings:
 | ~SPC h m~   | search available man pages                            |
 | ~SPC h n~   | browse emacs news                                     |
 
+The =Profiler= is a tool that helps you identify why your editor is running
+slowly or consumes a lot of memory. Here are key bindings relate to it:
+
+| Key Binding | Description                 |
+|-------------+-----------------------------|
+| ~SPC h P k~ | stop the profiler           |
+| ~SPC h P r~ | display the profiler report |
+| ~SPC h P s~ | start the profiler          |
+| ~SPC h P w~ | write the report to file    |
+
 Navigation key bindings in =help-mode=:
 
 | Key Binding  | Description                                         |

layers/+spacemacs/spacemacs-defaults/keybindings.el

@@ -32,6 +32,7 @@
                                        ("g"   "git/versions-control")
                                        ("h"   "help")
                                        ("hd"  "help-describe")
+                                       ("hP"  "profiler")
                                        ("i"   "insertion")
                                        ("j"   "jump/join/split")
                                        ("k"   "lisp")
@@ -241,7 +242,11 @@
   "hdt" 'describe-theme
   "hdv" 'describe-variable
   "hI"  'spacemacs/report-issue
-  "hn"  'view-emacs-news)
+  "hn"  'view-emacs-news
+  "hPs" 'profiler-start
+  "hPk" 'profiler-stop
+  "hPr" 'profiler-report
+  "hPw" 'profiler-report-write-profile)
 ;; insert stuff ---------------------------------------------------------------
 (spacemacs/set-leader-keys
   "iJ" 'spacemacs/insert-line-below-no-indent