feat(del): adds glob support for deletion

testdata/del__glob__ok.ct

@@ -0,0 +1,10 @@
+$ pda set a1 1
+$ pda set a2 2
+$ pda set b1 3
+$ pda del --glob a* --force
+$ pda get a1 --> FAIL
+Error: cannot get 'a1': Key not found
+$ pda get a2 --> FAIL
+Error: cannot get 'a2': Key not found
+$ pda get b1
+3

testdata/help__del__ok.ct

@@ -10,6 +10,7 @@ Aliases:
 
 Flags:
   -f, --force   Force delete without confirmation
+  -g, --glob    Treat KEY arguments as glob patterns
   -h, --help    help for del
 Delete one or more keys. Optionally specify a db.
 
@@ -21,4 +22,5 @@ Aliases:
 
 Flags:
   -f, --force   Force delete without confirmation
+  -g, --glob    Treat KEY arguments as glob patterns
   -h, --help    help for del