feat: aliases

feat: add aliases to --list and --list-all flags

feat: add aliases to --summary

feat: enable aliases for included tasks

tests: added alias unit tests

testdata/alias/alias-summary.txt

@@ -0,0 +1,11 @@
+task: foo
+
+(task does not have description or summary)
+
+aliases:
+ - f
+ - x
+
+commands:
+ - echo "foo"
+ - Task: b