Add Celo network support

[rohanspersonalgit]

Summary

• Adds celo case to the CryptoNetwork enum for wallet address registration support.

Test plan

• Build verified (xcodebuild build passes)
• Existing tests continue to pass (enum uses CaseIterable, no exhaustive switches to update)

[github-actions]

⚠️ Public API changes detected:

StripeCryptoOnramp

SPI API

+  @_spi(CryptoOnrampAlpha) case celo

If you are adding a new public API consider the following:

• Do these APIs need to be public or can they be protected with @_spi(STP)?
• If these APIs need to be public, assess whether they require an API review.

If you are modifying or removing a public API:

• Does this require a breaking version change?
• Do these changes require API review?

If you confirm these APIs need to be added/updated and have undergone necessary review, add the label modifies public API to this PR to acknowledge the interface change.
Additionally, if you modified or removed an existing API, ensure you update the changelog to reflect the necessary version bump for your changes. Regular public API changes require a MAJOR version bump, and SPI API changes (other than declarations using only @_spi(STP) and/or @_spi(ReactNativeSDK)) require a MINOR or MAJOR version bump.

ℹ️ If this comment appears to be left in error, make sure your branch is up-to-date with master.