fix: Make the StorageOption returned by LocalStorageHelper.getOptions() serializable

[jianglai]

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
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Fixes #605 ☕️

[BenWhitehead]

thanks for the contribution @jianglai! I've pushed an additional commit which also tests the customOptions path (and slightly tweaked the factory to support that).

[jianglai]

Thank you! Any chance you can cut a release soon so that I can actually use it?

[BenWhitehead]

We did a release last yesterday which is currently flowing out through the larger gcp library suite, so once that's complete we can easily cut a new release here.

[jianglai]

Hi Ben, do you have an ETA on when the next release is happening?

[BenWhitehead]

Apologies on the delay, I've just triggered the release and it should be available on maven central soon.

[BenWhitehead]

Release version is v0.123.4

[jianglai]

Many thanks!