Feat/Support selectedFeatures for multiple maps concurrently

[okdv]

Pull Request Checklist:

Please ensure the following points are checked before requesting a review. Asterisk (*) denotes that it is required prior to merge.

• I have read the CONTRIBUTING.md document. *
• I have updated the documentation (if applicable).
• I have added or updated any relevant tests
• I have run npm run pre-push * (if playwright test failed just notate why below)
• I merged (or rebased) develop into my branch before pushing *
• This PR is ready for review and not a draft. *

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Description:

Updated store so that is uses a Record Set of selectedFeatures within a Record Set of maps (interactive layers)
add functions to the stores service to make updating nested Records simple
updated map service to properly find the selected layer and selector again (using new store data)
created a svelte store for storing the current interactive layer, it is a store only no localstorage

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Related Issues (if any):

closes #108

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Type of Change:

Please check the applicable options.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring/Code quality improvement
• Other (please describe below)

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How Has This Been Tested?

wasnt sure of any tests to add atm, may add some when entire feature is done
pre-push

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Screenshots (if applicable):

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Additional Comments: