Make SwapsController support multichain

### What is this about?

Make SwapsController support multichain.

The swaps controller currently relies upon the "globally selected network". It should be refactored such that each chain interaction is made by methods that include a networkClientId parameter, which determines which network client/chain is used.

### Scenario

_No response_

### Design

_No response_

### Technical Details

N/A

### Threat Modeling Framework

N/A

### Acceptance Criteria

- The controller no longer relies upon the globally selected network.
- All operations involving a chain specify a `networkClientId`.

### Stakeholder review needed before the work gets merged

- [X] Engineering (needed in most cases)
- [ ] Design
- [ ] Product
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### References

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