[Epic] Separating soroban-rpc to prepare for repo change #3329

Job	Run time
Unit tests (ubuntu-20.04, 1.21)	6m 44s
Integration tests (ubuntu-20.04, 1.21, .CLI.)	19m 32s
Build (ubuntu-latest, x86_64-unknown-linux-gnu, amd64)	2m 28s
Unit tests (ubuntu-22.04, 1.21)	6m 20s
Integration tests (ubuntu-20.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	16m 20s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, arm64)	2m 53s
Integration tests (ubuntu-22.04, 1.21, .CLI.)	19m 37s
Build (macos-latest, x86_64-apple-darwin, amd64)	5m 58s
Integration tests (ubuntu-22.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	15m 44s
Build (macos-latest, aarch64-apple-darwin, arm64)	5m 18s
Build (windows-latest, x86_64-pc-windows-gnu, amd64)	9m 1s
	1h 49m 55s

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