Make st.write call st.json to display Streamlit secrets object

[snehankekre]

Describe your changes

When you call st.write(st.secrets), the output is displayed as inline code with st.markdown. This PR makes st.write call st.json on objects of type streamlit.runtime.secrets.Secrets

GitHub Issue Link (if applicable)

Closes #2905.

Testing Plan

• Added Python unit test

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[LukasMasuch]

Overall, I think this LGTM 👍 But it might be worth to evaluate if we actually want to add an explicit to_dict (preferred) or to_json method to st.secrets. The __repr__ call isn't necessarily guaranteeing that it returns a valid json, its just doing that at the moment.

[snehankekre]

Thanks, Lukas!

The repr call isn't necessarily guaranteeing that it returns a valid json

Good point, I've added a to_dict method to the Secrets class. Is this what you had in mind?

[LukasMasuch]

Yep, I think that looks good 👍 added one comment above. And have you tested it manually with nested secrets if it works as expected?

[snehankekre]

And have you tested it manually with nested secrets?

I did and it works as expected 😄

[github-actions]

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