feat(wm): add locked containers per workspace

This commit adds the concept of locked container indexes to komorebi
workspaces.

When a container index is locked, it can only be displaced by manual
user actual - usually when another container is moved there, and when
this happens, that container becomes the locked container.

In the locked state, the container at the locked index should never be
displaced by new windows opening or existing windows around it being
closed.

When the total number of containers on a workspace falls below the
number of the locked index, the locked index will be removed.

A locked index can be identified by a special border color linked to the
new WindowKind::UnfocusedLocked variant.

The implementation of locked container indexes is backed by a new data
structure called a LockedDeque, which is a VecDeque with an auxiliary
HashSet which keeps track of locked indices.

A new komorebic command "toggle-lock" has been added to support
programmatic use of this feature, as well as the
LockMonitorWorkspaceContainer and UnlockMonitorWorkspaceContainer
SocketMessage variants which can be used by status bars.

schema.json

@@ -2211,6 +2211,38 @@
                 "Mantle",
                 "Crust"
               ]
+            },
+            "unfocused_locked_border": {
+              "description": "Border colour when the container is unfocused and locked (default: Red)",
+              "type": "string",
+              "enum": [
+                "Rosewater",
+                "Flamingo",
+                "Pink",
+                "Mauve",
+                "Red",
+                "Maroon",
+                "Peach",
+                "Yellow",
+                "Green",
+                "Teal",
+                "Sky",
+                "Sapphire",
+                "Blue",
+                "Lavender",
+                "Text",
+                "Subtext1",
+                "Subtext0",
+                "Overlay2",
+                "Overlay1",
+                "Overlay0",
+                "Surface2",
+                "Surface1",
+                "Surface0",
+                "Base",
+                "Mantle",
+                "Crust"
+              ]
             }
           }
         },
@@ -2700,6 +2732,28 @@
                 "Base0E",
                 "Base0F"
               ]
+            },
+            "unfocused_locked_border": {
+              "description": "Border colour when the container is unfocused and locked (default: Base08)",
+              "type": "string",
+              "enum": [
+                "Base00",
+                "Base01",
+                "Base02",
+                "Base03",
+                "Base04",
+                "Base05",
+                "Base06",
+                "Base07",
+                "Base08",
+                "Base09",
+                "Base0A",
+                "Base0B",
+                "Base0C",
+                "Base0D",
+                "Base0E",
+                "Base0F"
+              ]
             }
           }
         }