[BEAM-10777] Add two blog posts detailing changes to the type hints module of the Python SDK

[saavan-google]

Please add a meaningful description for your change here

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Post-Commit Tests Status (on master branch)

Lang	SDK	Dataflow	Flink	Samza	Spark	Twister2
Go		---		---		---
Java
Python				---		---
XLang		---		---		---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website
Non-portable
Portable	---		---	---

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[saavan-google]

R: @udim
R: @robertwb

[udim]

Run Website_Stage_GCS PreCommit

[udim]

Looks good, I had a few comments.
There's a new whitespace check that's failing. :(

[saavan-google]

Looks good, I had a few comments.
There's a new whitespace check that's failing. :(

Thanks, pushed some changes. PTAL when you have the chance