feat: add path and collection standard library helpers

tests/41_stdlib_path.claro

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+IMPORT "lib/path.claro" AS path
+
+CALL path.join WITH "notes", "today.txt"
+SAY RESULT
+CALL path.basename WITH "notes/today.txt"
+SAY RESULT
+CALL path.dirname WITH "notes/today.txt"
+SAY RESULT
+CALL path.ext WITH "notes/today.txt"
+SAY RESULT
+CALL path.stem WITH "notes/today.txt"
+SAY RESULT
+CALL path.absolute WITH "/home/learner"
+SAY RESULT
+CALL path.absolute WITH "notes/today.txt"
+SAY RESULT

tests/41_stdlib_path.out

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+notes/today.txt
+today.txt
+notes
+txt
+today
+YES
+NO

tests/42_stdlib_collections.claro

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+IMPORT "lib/collections.claro" AS collections
+
+SET words AS LIST OF TEXT TO LIST
+ADD "Ada" TO words
+ADD "Grace" TO words
+ADD "Lin" TO words
+
+CALL collections.length WITH words
+SAY RESULT
+CALL collections.contains WITH words, "Grace"
+SAY RESULT
+CALL collections.index WITH words, "Lin"
+SAY RESULT
+CALL collections.join WITH words, " | "
+SAY RESULT
+CALL collections.reversed WITH words
+SET backwards TO RESULT
+GET backwards AT 1 AS first
+SAY first
+
+SET scores AS MAP OF NUMBER TO MAP
+PUT scores KEY "math" VALUE 95
+PUT scores KEY "science" VALUE 88
+CALL collections.has_key WITH scores, "math"
+SAY RESULT
+CALL collections.get WITH scores, "science", 0
+SAY RESULT
+CALL collections.keys WITH scores
+SET subjects TO RESULT
+COUNT subjects AS subjectCount
+SAY subjectCount

tests/42_stdlib_collections.out

@@ -0,0 +1,8 @@
+3
+YES
+3
+Ada | Grace | Lin
+Lin
+YES
+88
+2