Fix Case insensetive matching in competitor check

[Parth94]

currently library doesnt identify "Sbi" as same as name mentioned in competitor "SBI"

Is this intentional or are we planning to bring in this support later?

Also on repo I can see we are already using Ignore case option but it doesnt seems to be working, so this is a bug mostly
https://github.com/guardrails-ai/competitor_check/blob/c905222840e409587a10fabe57c0c94e397f8d9f/validator/main.py#L88C12-L88C60
match = re.search(pattern, text, re.IGNORECASE)

Ran below on https://hub.guardrailsai.com/validator/guardrails/competitor_check