fix: correctly pass custom attributes

[devrnt]

Resolves issue where custom attributes were not passed to Intercom.

• Add "super-seeded" boot in playground
• Add mapping tests, camel cased attributes should correctly be passed to Intercom. E.g. appId to app_id, verticalPadding to vertical_padding...
• Update IntercomProps to receive a customAttributes prop. This is an object with all the raw custom attribute key-value entries.

Fixes #16,
Fixes #17

[github-actions]

Size Change: +60 B (0%)

Total Size: 9.35 kB

Filename	Size	Change
dist/react-use-intercom.cjs.development.js	3.53 kB	+18 B (0%)
dist/react-use-intercom.cjs.production.min.js	2.25 kB	+24 B (1%)
dist/react-use-intercom.esm.js	3.42 kB	+18 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
dist/index.js	152 B	0 B

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