feat(fgw): addition of a gateway + removal of starknet-provider #1146

Job	Run time
Enforce CHANGELOG / changelog	3s
Run linters / toml-lint	8s
Run linters / markdown-lint	14s
Run Coverage / coverage	1m 26s
Run linters / prettier	20s
Run check / rust_check	1m 25s
Run Cargo linters / cargo-lint	1m 43s
	5m 19s

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