Rename executable to lark-shell

[ThatXliner]

Closes #2

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.44%.

Quality metrics	Before	After	Change
Complexity	1.82 ⭐	2.03 ⭐	0.21 👎
Method Length	37.43 ⭐	38.38 ⭐	0.95 👎
Working memory	6.93 🙂	6.71 🙂	-0.22 👍
Quality	80.67% ⭐	81.11% ⭐	0.44% 👍

Other metrics	Before	After	Change
Lines	87	106	19

Changed files	Quality Before	Quality After	Quality Change
lark_shell.py	80.67% ⭐	81.11% ⭐	0.44% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

Legend and Explanation

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• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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