Extract foscam base entity for reuse

[krmarien]

Breaking change

Proposed change

Extra base FoscamEntity from camera to reuse it in to be added other platforms.

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 #
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Checklist

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

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

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[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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[jpbede]

Just a minor thing, we can make use of the const's here