feat: Add MP3Reader class for mp3 file reader

[Deepchavda007]

Description

• Summary: This PR introduces a new feature that adds the MP3Reader class for reading and processing MP3 files to extract text data.

• Related Issue: This feature was developed to enhance the capability of the project to handle audio input, specifically MP3 files, and convert them into a textual format

Type of change

• New features (non-breaking change).

Checklist

• I have performed a self-review of my code.
• I have added thorough tests if it is a core feature.
• The feature is well documented.

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[cin-albert]

Hi @Deepchavda007,
I believe this PR is not finished yet. Please add the Reader to the list of file extractors and make it visible in the UI.
References:

kotaemon/libs/kotaemon/kotaemon/indices/ingests/files.py

Lines 38 to 54 in e2bd78e

	KH_DEFAULT_FILE_EXTRACTORS: dict[str, BaseReader] = {
	".xlsx": PandasExcelReader(),
	".docx": unstructured,
	".pptx": unstructured,
	".xls": unstructured,
	".doc": unstructured,
	".html": HtmlReader(),
	".mhtml": MhtmlReader(),
	".png": unstructured,
	".jpeg": unstructured,
	".jpg": unstructured,
	".tiff": unstructured,
	".tif": unstructured,
	".pdf": PDFThumbnailReader(),
	".txt": TxtReader(),
	".md": TxtReader(),
	}

[Deepchavda007]

@cin-albert Implemented the changes as per your suggestion. Please review the updated code. Thank you!

[Deepchavda007]

@taprosoft @cin-albert Is there anything else needed from my end, or any additional feedback before it can be merged? Thanks for your time!