Consider adding a Reactive operator decision tree/flowchart

[banchan86]

Based on an idea proposed by @jonnew on Discord, to enhance our Reactive operator documentation, we might want to consider adding a decision tree to easily choose Reactive operators. This could be added as an article on the main docs (hence why this issue is raised here) and added as a link to the respective API pages for the Reactive operators.

Possible references

• https://reactivex.io/documentation/operators.html#tree (although personal opinion I'm not a fan of this format)
• https://rxjs.dev/operator-decision-tree (interactive decision tree but might take a bit of work)
• https://xgrommx.github.io/rx-book/content/which_operator_do_i_use/creation_operators.html (personal opinion I like this one)