Standardize README shield badges

[marcduiker]

We want to update the README for all Dapr repos so they all include shield badges for YouTube, Discord, X/Twitter and ensure they are all in the same style. See: dapr/community#355

These are the shield badges for the python-sdk repo.

Snippet to include in the README:

[![PyPI - Version](https://img.shields.io/pypi/v/dapr?style=flat&logo=pypi&logoColor=white&label=Latest%20version)](https://pypi.org/project/dapr/) [![PyPI - Downloads](https://img.shields.io/pypi/dm/dapr?style=flat&logo=pypi&logoColor=white&label=Downloads)](https://pypi.org/project/dapr/) [![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/dapr/python-sdk/.github%2Fworkflows%2Fbuild.yaml?branch=main&label=Build&logo=github)](https://github.com/dapr/python-sdk/actions/workflows/build.yaml) [![codecov](https://codecov.io/gh/dapr/python-sdk/branch/main/graph/badge.svg)](https://codecov.io/gh/dapr/python-sdk) [![GitHub License](https://img.shields.io/github/license/dapr/python-sdk?style=flat&label=License&logo=github)](https://github.com/dapr/python-sdk/blob/main/LICENSE) [![GitHub issue custom search in repo](https://img.shields.io/github/issues-search/dapr/python-sdk?query=type%3Aissue%20is%3Aopen%20label%3A%22good%20first%20issue%22&label=Good%20first%20issues&style=flat&logo=github)](https://github.com/dapr/python-sdk/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22) [![Discord](https://img.shields.io/discord/778680217417809931?label=Discord&style=flat&logo=discord)](http://bit.ly/dapr-discord) [![YouTube Channel Views](https://img.shields.io/youtube/channel/views/UCtpSQ9BLB_3EXdWAUQYwnRA?style=flat&label=YouTube%20views&logo=youtube)](https://youtube.com/@daprdev) [![X (formerly Twitter) Follow](https://img.shields.io/twitter/follow/daprdev?logo=x&style=flat)](https://twitter.com/daprdev)

Contributing

• Comment /assign on this issue if you want to self-assign this issue and update the README.
• Don't forget to sign off your commit, for more details see Developer Certificate of Origin (DCO) in the docs.

@ maintainers: Please label this as good first issue.

[pdebruin]

/assign