Merge pull request #20 from kcl-lang/collectionutil-module

feat: add collectionutil module v0.0.1

collectionutil/README.md

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+## Introduction
+
+`collectionutil` is a kcl module for list and config values
+
+## How to Use
+
++ Add the dependency
+
+```shell
+kpm add collectionutil
+```
+
++ Write the kcl code
+
+```python
+import collectionutil
+
+items = collectionutil.to_str_set(["aa", "aa", "bb"])  # ["aa", "bb"]
+```
+
+## Resource
+
+Code source and document is [here](https://github.com/kcl-lang/artifacthub/tree/main/collectionutil)

collectionutil/kcl.mod

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+[package]
+name = "collectionutil"
+version = "0.0.1"
+description = "`collectionutil` is a kcl module for list and config values"

collectionutil/main.k

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+
+to_str_set = lambda items: [str] {
+    [item for item in {item = None for item in items}]
+}