Prepare v1.3.0 release

[popematt]

Issue #, if available:

None

Description of changes:

Release 1.3.0 Notes

What's Changed

• Ensure that all empty PersistentLists are the same instance. by @popematt in Ensure that all empty PersistentLists are the same instance. #91
• Fix equals implementation to respect that anyone is allowed to implement IonElement by @popematt in Fix equals implementation to respect that anyone is allowed to implement IonElement #88
• Use Gradle 8.6, Kotlin build script, and conventional gradle layout by @popematt in Use Gradle 8.6, Kotlin build script, and conventional gradle layout #94
• Update README.md by @jobarr-amzn in Update README.md #96
• Fix broken publishing tasks in build script by @popematt in Fix broken publishing tasks in build script #97
• Deprecate buildStruct() in favor of idiomatic ionStructOf() overloads by @popematt in Deprecate buildStruct() in favor of idiomatic ionStructOf() overloads #99
• Loader rewrite by @popematt in Loader rewrite #100
• Replaces persistent collections with immutable collections by @popematt in Replaces persistent collections with immutable collections #101
• Make loadAllElements fall back to an iterative implementation once a certain depth is reached by @popematt in Make loadAllElements fall back to an iterative implementation once a certain depth is reached #103

New Contributors

• @jobarr-amzn made their first contribution in Update README.md #96

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.