Implement FromStr<Path> for ics24_host::Path

[seanchen1991]

Crate

The ibc crate.

Summary

Implement FromStr<Path> for ics24_host::Path in order to facilitate deserialization in concrete Paths in basecoin-rs.

Problem Definition

As part of #14 in basecoin-rs, we're looking to add the ability to deserialize string paths into concrete Paths. While this could be done on the Basecoin side, this is functionality that others will likely find useful so well, so it makes sense to implement it in ibc-rs to reduce code duplication.

Proposal

Implement FromStr<Path>, which would essentially be doing the opposite of the Display<Path> impl.

Acceptance Criteria

Implementing of FromStr<Path> added with adequate testing coverage.

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