fix: available Font Family Regression

[bdkopen]

Changes in #2640 caused a regression by not providing proper support for font families made available within the library. This has caused any font families that are built-in to the library to default to Helvetica.

Changes

• Properly handles run.attributes.font as an array so any strings properlygetOrCreateFont their associated fonts.
• Update the test page to include fonts made available within the library.

Related

Issue: #2730

Example

Before the change:

After the change:

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Latest commit: e2afe2ce3f7b167ec758aed0524fbcc8ff7c55dc

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[bdkopen]

@diegomura tagging to notify that this fixes a recent regression. Please let me know if you need anything else with this. Thanks!