Add support for encoders and decoders on useURLState

[TejasQ]

On useURLState, we often want to encodeURIComponent and decodeURIcomponent to work with formatted strings.

For example, if I useURLState to persist a tab named Tables (123), then I want to be able to:

• encode it and store an URL-encoded version in the URL
• decode it and return it to a consumer React function component.

Currently, it does not work this way.