feat(manifests): cross-browesr manifest handling; dev/build commands

[JoeyDoey]

• allow CRX options to be passed into getManifest func
• better FF extension handling
• clean up dev/build cli scripts
• clean up bedframe.config

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 374e197e1cd07c662e170341485619fe902edb64

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

| Name | Type | | --------------- | ----- | | @bedframe/core | Patch | | @bedframe/cli | Patch | | create-bedframe | Patch |

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