adds changes to create a module for `Isl*` implementations

amazon-ion / ion-schema-rust

Rust implementation of Ion Schema

Apache License 2.0

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Closed desaikd closed 3 years ago

desaikd commented 3 years ago

Issue: Fixes #26

Description of changes: This PR works on creating a separate module for all Isl* implementations

Changes:

adds doc comment to define the role of Isl* implementations.
adds a module called Isl for IslType, IslConstraint and IslTypeRef implementation.