Add contexted exception to the library (#17)

* Add contexted exception

* Fix code format

Author: shashankrnr32

docs/package/.pages

@@ -1,4 +1,5 @@
 nav:
     - ...
+    - stringutils: stringutils.md
 
 title: Package Documentation

docs/package/container/.pages

@@ -0,0 +1 @@
+::: pycommons.lang.stringutils

docs/package/container/optional.md

@@ -59,7 +59,22 @@ theme:
   language: en
   base_url: https://github.com/pycommons/pycommons-lang
   palette:
-    primary: 'white'
+    # Palette toggle for light mode
+    - scheme: default
+      primary: blue grey
+      accent: red
+      toggle:
+        icon: material/brightness-7
+        name: Switch to dark mode
+
+    # Palette toggle for dark mode
+    - scheme: slate
+      primary: blue grey
+      accent: red
+      toggle:
+        icon: material/brightness-4
+        name: Switch to light mode
+
 # Footer
 extra:
   config_override: false

docs/package/stringutils.md

@@ -5,7 +5,6 @@
 
 from .arrayutils import ArrayUtils
 from .charutils import CharUtils
-from .exceptionutils import ExceptionUtils
 from .stringutils import StringUtils
 
 __all__ = [
@@ -14,7 +13,6 @@
     "__version__",
     "ArrayUtils",
     "CharUtils",
-    "ExceptionUtils",
     "StringUtils",
 ]
 

docs/package/utils/.pages

@@ -0,0 +1,5 @@
+from .contexted import ContextedException
+from .exception import CommonsException
+from .exceptionutils import ExceptionUtils
+
+__all__ = ["CommonsException", "ContextedException", "ExceptionUtils"]