feat/ Add support for XML file format

[OjusWiZard]

Description

• I've added a new loader and a chunker specifically for XML file format. The loader is OK but the chunker is the same as most of the others (maybe we can refactor this to respect DRY).
• Wired up both of them in other places to link them with the entry point.
• Added a test for the loader
• Also, there was one small styling that black did.

Fixes #714

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• Refactor (does not change functionality, e.g. code style improvements, linting)

How Has This Been Tested?

I've added one test for the loader. Also, tested with a custom script as follows:

from os import environ
from embedchain import App

environ["OPENAI_API_KEY"] = "xxx"
app = App()
app.add("xml.xml")
response = app.query("What is the given context?")
print(response)

Please delete options that are not relevant.

• Unit Test
• Test Script (please provide)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes Add support for xml file format #714
• Made sure Checks passed

[deshraj]

Neat @OjusWiZard. Thank you for your contribution!

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
embedchain/data_formatter/data_formatter.py	87.27% <100.00%> (+0.48%)	⬆️
embedchain/loaders/xml.py	100.00% <100.00%> (ø)
embedchain/models/data_type.py	100.00% <100.00%> (ø)
embedchain/utils.py	69.14% <50.00%> (-1.19%)	⬇️
embedchain/chunkers/xml.py	66.66% <66.66%> (ø)

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