sp-std removal from substrate/primitives (#3274)
This PR removes sp-std crate from substrate/primitives sub-directories.
For now crates that have `pub use` of sp-std or export macros that would
necessitate users of the macros to `extern crate alloc` have been
excluded from this PR.
There should be no breaking changes in this PR.
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Co-authored-by: Koute <[email protected]>
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