Added ticker news insights support

[justinpolygon]

Fixes #708.

This PR adds support for Ticker News Insights where it ranks mentioned tickers by sentiment (negative, neutral, or positive) and then provides the reasoning why.

Here's an example script:

from polygon import RESTClient
from polygon.rest.models import (
    TickerNews,
)

client = RESTClient()  # POLYGON_API_KEY environment variable is used

news = []
for n in client.list_ticker_news("MSFT", order="desc", limit=1000):
    news.append(n)

# print date + title
for index, item in enumerate(news):
    if isinstance(item, TickerNews):
        print(item)

        if index == 10:
            break

You'll get a response object that now lists insights like the following:

TickerNews(
    amp_url=None,
    article_url="https://www.benzinga.com/news/24/07/39795029/googles-potential-23b-wiz-acquisition-set-to-enhance-cloud-security",
    author="Shivani Kumaresan, Benzinga Staff Writer",
    description="Google is in advanced talks to acquire cloud security firm Wiz for up to $23 billion, which would significantly enhance Google's cloud security capabilities and help it compete with major rivals like Amazon and Microsoft.",
    id="47cad2ae843c02ec8a24171476531bd58b7e8831ede6503f8e2d16b0f5fda341",
    image_url="https://cdn.benzinga.com/files/images/story/2024/07/16/Google-Shutterstock.jpeg?width=1200&height=800&fit=crop",
    insights=[
        Insight(
            sentiment="positive",
            sentiment_reasoning="The article suggests that the potential acquisition of Wiz would enhance Google's cloud security offerings and help it better compete in the cloud security market.",
            ticker="GOOG",
        ),
        Insight(
            sentiment="positive",
            sentiment_reasoning="The article suggests that the potential acquisition of Wiz would enhance Google's cloud security offerings and help it better compete in the cloud security market.",
            ticker="GOOGL",
        ),
        Insight(
            sentiment="neutral",
            sentiment_reasoning="The article mentions Amazon Web Services as a major competitor in the cloud security market, but does not provide any specific information about Amazon's sentiment.",
            ticker="AMZN",
        ),
        Insight(
            sentiment="neutral",
            sentiment_reasoning="The article mentions Microsoft as a major competitor in the cloud security market, but does not provide any specific information about Microsoft's sentiment.",
            ticker="MSFT",
        ),
    ],
    keywords=["Google", "Wiz", "cloud security", "acquisition"],
    published_utc="2024-07-16T13:39:15Z",
    publisher=Publisher(
        favicon_url="https://s3.polygon.io/public/assets/news/favicons/benzinga.ico",
        homepage_url="https://www.benzinga.com/",
        logo_url="https://s3.polygon.io/public/assets/news/logos/benzinga.svg",
        name="Benzinga",
    ),
    tickers=["GOOG", "GOOGL", "AMZN", "MSFT"],
    title="Google's Potential $23B Wiz Acquisition Set To Enhance Cloud Security - Benzinga",
)