feat(globs): glob support for dump/restore, extracts some shared logic

testdata/dump__glob__ok.ct

@@ -0,0 +1,8 @@
+$ pda set a1 1
+$ pda set a2 2
+$ pda set b1 3
+$ pda dump --glob a*
+{"key":"a1","value":"1","encoding":"text"}
+{"key":"a2","value":"2","encoding":"text"}
+$ pda dump --glob c* --> FAIL
+Error: cannot dump '@default': No matches for pattern

testdata/help__dump__ok.ct

@@ -10,6 +10,8 @@ Aliases:
 
 Flags:
   -e, --encoding string   value encoding: auto, base64, or text (default "auto")
+  -g, --glob strings      Filter keys with glob pattern (repeatable)
+      --glob-sep string   Characters treated as separators for globbing (default "/-_.@: ")
   -h, --help              help for dump
       --secret            Include entries marked as secret
 Dump all key/value pairs as NDJSON
@@ -22,5 +24,7 @@ Aliases:
 
 Flags:
   -e, --encoding string   value encoding: auto, base64, or text (default "auto")
+  -g, --glob strings      Filter keys with glob pattern (repeatable)
+      --glob-sep string   Characters treated as separators for globbing (default "/-_.@: ")
   -h, --help              help for dump
       --secret            Include entries marked as secret

testdata/help__restore__ok.ct

@@ -9,8 +9,10 @@ Aliases:
   restore, import
 
 Flags:
-  -f, --file string   Path to an NDJSON dump (defaults to stdin)
-  -h, --help          help for restore
+  -f, --file string       Path to an NDJSON dump (defaults to stdin)
+  -g, --glob strings      Restore keys matching glob pattern (repeatable)
+      --glob-sep string   Characters treated as separators for globbing (default "/-_.@: ")
+  -h, --help              help for restore
 Restore key/value pairs from an NDJSON dump
 
 Usage:
@@ -20,5 +22,7 @@ Aliases:
   restore, import
 
 Flags:
-  -f, --file string   Path to an NDJSON dump (defaults to stdin)
-  -h, --help          help for restore
+  -f, --file string       Path to an NDJSON dump (defaults to stdin)
+  -g, --glob strings      Restore keys matching glob pattern (repeatable)
+      --glob-sep string   Characters treated as separators for globbing (default "/-_.@: ")
+  -h, --help              help for restore

testdata/restore__glob__ok.ct

@@ -0,0 +1,15 @@
+$ pda set a1 1
+$ pda set a2 2
+$ pda set b1 3
+$ fecho dumpfile {"key":"a1","value":"1","encoding":"text"} {"key":"a2","value":"2","encoding":"text"} {"key":"b1","value":"3","encoding":"text"}
+$ pda del a1 a2 b1 --force
+$ pda restore --glob a* --file dumpfile
+Restored 2 entries into @default
+$ pda get a1
+1
+$ pda get a2
+2
+$ pda get b1 --> FAIL
+Error: cannot get 'b1': Key not found
+$ pda restore --glob c* --file dumpfile --> FAIL
+Error: cannot restore '@default': No matches for pattern