feat: create Frontend feature flags

[mfortman11]

First iteration of #2814

To improve the process of keeping DataStax Langflow in sync w/ OSS

This PR wraps some of the simpler features to be easily toggled on and off via the JSON file

These feature are:

• ENABLE_DARK_MODE - DS portal doesn't yet support dark mode so we turn this off more a more uniform experience
• ENABLE_API - Hides the API button to get info on how to call your flow via the REST endpoint
• ENABLE_LANGFLOW_STORE - Auto set hasStore to false if this is false
• ENABLE_PROFILE_ICONS - DS already had profile images 2 sets of them aren't needed

[github-actions]

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_{Last Modified at 29 Jul 24 14:21 UTC}

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[anovazzi1]

LGTM