Centralize all dependecies in hyperspace directory

[sylvaincormier]

Customizing our own version of substrate is harder if the code resides in other repositories.
ex:

sc-cli        = { git = "https://github.com/new-mvs/substrate", branch = "latest" }

or

sc-client-api       = { git = "https://github.com/darwinia-network/substrate.git", branch = "common-library" }

especially when its a specific version like:

source = "git+https://github.com/new-mvs/merkle-mountain-range.git#6ab7d95f407aa345e8f7fd6681a127609ad50e5a"

Why can't everything be contained locally like:

hyperspace-claims                     = { default-features = false, path = "../../../../frame/claims" }