drop clvm-trait's dependency on clvmr

[arvidn]

remove the ToNodePtr and FromNodePtr traits as well as FromClvm and ToClvm for Allocator and NodePtr (those will be moved into clvmr).

This is one step in untangling the dependency cycle caused by making clvmr use chia-bls.

In order to keep everything building, all other crates that depend on clvm-traits now use the crates.io version (i.e. stay on the current version).

once this lands, clvm_rs can be updated to implement the clvm-traits. Then this repository can be restored to depend on the new clvm_rs and clvm-traits

[coveralls-official]

Pull Request Test Coverage Report for Build 7091730462

• 152 of 158 (96.2%) changed or added relevant lines in 3 files are covered.
• 7 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.08%) to 86.244%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
clvm-traits/src/lib.rs	84	90	93.33%

Files with Coverage Reduction	New Missed Lines	%
clvm-traits/src/error.rs	1	0.0%
clvm-derive/src/helpers.rs	3	75.86%
clvm-traits/src/clvm_decoder.rs	3	0.0%

Totals
Change from base Build 7091231638:	-0.08%
Covered Lines:	10840
Relevant Lines:	12569

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💛 - Coveralls

[Rigidity]

Can't formally review, but here's some comments