Issue 813. Made watch interval configurable through global setting in Taskfile and through CLI arg.

Separated Taskfile param and Arg flag

testdata/watcher_interval/.gitignore

@@ -0,0 +1 @@
+src/*

testdata/watcher_interval/Taskfile.yaml

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+# https://taskfile.dev
+
+version: '3'
+
+vars:
+  GREETING: Hello, World!
+
+interval: "50ms"
+
+tasks:
+  default:
+    sources:
+      - "src/*"
+    cmds:
+      - echo "{{.GREETING}}"
+    silent: false