feat: Scroll blocks into bounds when focusing them. (#239)

* feat: Scroll blocks into bounds when focusing them.

* fix: Fix compatibility with Blockly 11.2.1.

* refactor: Optimize for top left corner visibility of blocks.

Co-authored-by: Christopher Allen <cpcallen+github@gmail.com>

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Co-authored-by: Christopher Allen <cpcallen+github@gmail.com>

Author: gonfunko