refactor: Make backend orchestrator, parser, and plugins PEP8

[gaurarpit]

Purpose

• Make backend orchestrator, parsers and plugins PEP8
• Resolves Make Orchestrator PEP8 compliant #856
• Resolves Make parser and plugins PEP8 compliant #857

Does this introduce a breaking change?

• Yes
• No

How to Test

• Run the tests:

poetry run pytest -m "not azure and not functional"    
poetry run pytest -m "functional"  

• Run the application locally and go to http://localhost:8502/Ingest_Data
• Upload a document on the above endpoint
• Verify that the content is available.

What to Check

• Verify that the content is available.

[github-actions]

Coverage Report •

File	Stmts	Miss	Cover	Missing
code/backend/batch/utilities/helpers
orchestrator_helper.py	13	4	69%	22–24, 27
code/backend/batch/utilities/helpers/config
config_helper.py	123	0	100%
code/backend/batch/utilities/orchestrator
__init__.py	11	0	100%
lang_chain_agent.py	60	19	68%	21–24, 26, 61–62, 82–85, 102–103, 106–109, 116–117
open_ai_functions.py	54	36	33%	62, 64, 70–73, 75, 78, 85–89, 93–94, 96, 102–106, 110–112, 115, 118–119, 122, 127–129, 132–134, 137, 142
orchestration_strategy.py	5	0	100%
orchestrator_base.py	50	8	84%	33, 72–74, 81–83, 93
semantic_kernel.py	54	0	100%
strategies.py	12	7	41%	8–13, 15
code/backend/batch/utilities/parser
output_parser_tool.py	39	0	100%
parser_base.py	9	2	77%	9, 19
code/backend/batch/utilities/plugins
chat_plugin.py	15	0	100%
post_answering_plugin.py	8	0	100%
TOTAL	2296	675	70%

Tests	Skipped	Failures	Errors	Time
178	0 💤	0 ❌	0 🔥	11.672s ⏱️

[superhindupur]

LGTM, you'll need to update and fix conflicts though.