Make Hydrawise initialize data immediately

[dknowles2]

Proposed change

Fix the initialization of the Hydrawise integration so that entities have data available on initialization. As currently implemented, state attributes aren't updated until the first data coordinator refresh, which means entities have unavailable status for 2 minutes after startup.

This encompasses two changes:

1. Update the base HydrawiseEntity class to set state attributes on initialization.
2. Modify the startup procedure so that we don't immediately fetch data from the Hydrawise API when initializing the client, and instead explicitly wait for a data coordinator update before forwarding entity setups. (e.g. the way that most other integrations handle startup)

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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[home-assistant]

Hey there @ptcryan, mind taking a look at this pull request as it has been labeled with an integration (hydrawise) you are listed as a code owner for? Thanks!

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[dknowles2]

Ping?

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[edenhaus]

Thanks @dknowles2 👍