Update swaps to include 0x fee

[HEagle18]

Description

0x just updated us that they will be charging 15bps on evm swaps on select pairs. This will only apply to the free tier which brave is currently on. Documentation on new field to reflecrt pricing is here https://0x.org/docs/0x-swap-api/api-references/get-swap-v1-quote#:~:text=fee%20type%20below.-,zeroExFee,-Related%20to%20fees

https://docs.google.com/document/d/1lWAglSlKg-ruByIiL7Xe2jF9O9UDC0orcYDz7FD6x_8/edit for more info on their plans

Steps to Reproduce

Actual result:

Expected result:

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Desktop Brave version:

Android Device details:

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Version/Channel Information:

• Can you reproduce this issue with the current release?
• Can you reproduce this issue with the beta channel?
• Can you reproduce this issue with the nightly channel?

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

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