Simplify markdown table generation in magic command - %ai list

[keerthi-swarna]

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Issue Reference: Issue-118

Description

Refactored the code responsible for generating markdown tables by replacing custom imperative logic with the py-markdown-table library.

• Closes #118.

Changes

• Updated the _ai_list_command_markdown method in magics.py to generate markdown tables using the py-markdown-table library.
• Modified the _ai_env_status_for_provider_markdown method to return the env_variable alongside its status in emoji form, replacing the previous approach where the emoji was appended to the env_variable string.
• Added the py-markdown-table library as a dependency in pyproject.toml.
• Updated the help text in the aws.py file to address an issue where markdown was not rendering correctly within a markdown table cell. To resolve this, markdown syntax was replaced with HTML tags to ensure proper rendering.

Testing

• Verified the changes by running Jupyter Lab in a local environment setup.
• Attached screenshots from the local environment for reference.