Issue number: #6600

Summary

This feature allows to pass a custom deserializer to ensure accurate handling of floating-point precision.

Changes

Added support for passing a custom deserializer instance to ApiGatewayResolver to handle JSON numeric values as Decimal, ensuring correct floating-point precision.

`
from tests.functional.utils import load_even
import json
from decimal import Decimal

app = ApiGatewayResolver(deserializer=partial(json.loads, parse_float=Decimal))
`

User experience

Please share what the user experience looks like before and after this change

`
app = ApiGatewayResolver(deserializer=partial(json.loads, parse_float=Decimal))

@app.post("/my/path")
def test_handler():
    return app.current_event.json_body

# WHEN calling the event handler
event = {}
event.update(LOAD_GW_EVENT)
event["body"] = '{"amount": 2.2999999999999998}'
event["httpMethod"] = "POST"

result = app(event, {})
# THEN process event correctly
assert result["statusCode"] == 200
assert result["multiValueHeaders"]["Content-Type"] == [content_types.APPLICATION_JSON]
assert result["body"] == '{"amount":"2.2999999999999998"}'

`

Checklist

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• Meet tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

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