feat: Add JSONClient to allow access to raw JSON response from J-Quants API

[hiohiohio]

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Is your feature request related to a problem? Please describe.

As a user of the jquants-api-client-python library, I would like to request the addition of a JSONClient to provide access to the raw JSON response from the J-Quants API. Currently, the library does not offer an option to access the JSON data directly, as it converts the API responses into Pandas dataframes by default.

By implementing a JSONClient, users who prefer to work with raw JSON data or use other data processing libraries can easily access the API responses in their desired format. This added flexibility will cater to a wider range of use cases and user preferences.

A potential example of how the JSONClient could be used is as follows:

import jquantsapi

my_mail_address = "*****"
my_password = "*****"
json_cli = jquantsapi.JSONClient(mail_address=my_mail_address, password=my_password)

response_json = json_cli.get_prices_daily_quotes(
    start_dt=datetime(2022, 7, 25, tzinfo=tz.gettz("Asia/Tokyo")),
    end_dt=datetime(2022, 7, 26, tzinfo=tz.gettz("Asia/Tokyo")),
)

In this example, response_json would contain the raw JSON response from the J-Quants API.

Thank you for considering this feature request. Adding a JSONClient would improve the overall user experience of the jquants-api-client-python library by offering greater flexibility and catering to diverse user needs.

Describe the solution you'd like.

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Describe an alternate solution.

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Anything else? (Additional Context)

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