dev: rename `StarknetConfig` to `KakarotConfig` #137

Job	Run time
Linters / clippy	1m 13s
Spell check / spell-check	10s
Linters / check	53s
Linters / fmt	31s
Set up submodules / submodules	3m 4s
Dump katana state / dump	5m 26s
Rust tests / test	2m 43s
	14m 0s

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