Conflict between AvlTree and Instant

[shahzaibak]

When using a AvlTree that contains and Instant, I get the following error:

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the trait bound scrypto::prelude::Instant: std::cmp::Ord is not satisfied [E0277]
the trait std::cmp::Ord is not implemented for scrypto::prelude::Instant
Note: required by a bound in scrypto_avltree::AvlTree

the trait bound scrypto::prelude::Instant: std::hash::Hash is not satisfied [E0277]
the trait std::hash::Hash is not implemented for scrypto::prelude::Instant
Note: required by a bound in scrypto_avltree::AvlTree

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radix_engine_common::time::instant

pub struct Instant