feat: add coinbase as an onramp item

[cfluke-cb]

General Changes

• Adds Coinbase pay feature as an onramp item

Developer Notes

the NEXT_PUBLIC_COINBASE_API_KEY we prefer to not be committed, we realize that it is discoverable, but prefer not to be searchable/indexed

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[0x4Graham]

gm,

Is there a governance post to go with this? UX/UI changes require a governance proposal first.

[cfluke-cb]

gm, We are still finalizing the proposal. Hopefully should post by Monday

[foodaka]

we are not ramping through UI