fix: fix serialization of Point and Location types

[mattjohnsonpint]

This fixes a bug found with JSON serialization of the Point and Location types used with Postgres and MySQL databases in the AssemblyScript SDK.

[linear]

HYP-3404 serialization bug in db types

[Copilot]

Pull Request Overview

This PR fixes a bug with JSON serialization and deserialization of the Point and Location types to work correctly with Postgres and MySQL databases. Key changes involve updating the serializer/deserializer methods in both classes to ensure valid JSON strings are output and processed, as well as corresponding adjustments to the test suite.

• Updated Point and Location classes to use the @JSON decorator.
• Modified serializer and deserializer methods to throw errors on invalid input.
• Added comprehensive tests to verify serialization and deserialization functionality.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
sdk/assemblyscript/src/tests/database.run.ts	Added a new test runner file for database serialization tests.
sdk/assemblyscript/src/assembly/database.ts	Updated the Point and Location classes to throw errors in deserializers and corrected the return type in fromString.
sdk/assemblyscript/src/assembly/tests/database.spec.ts	Added tests for both Point and Location serialization/deserialization.
CHANGELOG.md	Updated changelog to reflect the fix in serialization logic.

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