feat: add space param to strategy playground

[wa0x6e]

Summary

This PR adds the space params to the strategy playground.

Currently, we pass a hardcoded empty string as space when testing strategies, but some strategies like "split-delegation" have specific voting power for each space.

This PR adds a new "space" input to the playground, defaulting to empty string.

How to test

1. Go to http://localhost:8081/#/playground/split-delegation?query=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.
2. It should show some positive Voting power for the address
3. When space is empty, it show 0 VP

[ChaituVR]

tAck