Add "Add custom chain" option to NetworksDropdown

[portdeveloper]

Description

Live at https://abi-ninja-nextjs-olive.vercel.app/

This PR

• Adds a group "CUSTOM" and an option "Add custom chain" to the NetworksDropdown.tsx
• Uses better naming with other chains and custom chains
• Adds custom chains to localStorage
• keeps wagmiConfig in zustand store to keep everything updated for better UX

demo below

chrome_rU7UpUHKme.mp4

Please feel free to point out/change anything you don't like!

Additional Information

• I have read the contributing docs (if this is your first contribution)
• This is not a duplicate of any existing pull request

Related Issues

_Closes #97

Note: If your changes are small and straightforward, you may skip the creation of an issue beforehand and remove this section. However, for medium-to-large changes, it is recommended to have an open issue for discussion and approval prior to submitting a pull request.

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Name	Status	Preview	Comments	Updated (UTC)
abi-ninja-v2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 23, 2024 4:05pm

[portdeveloper]

closing because i have another branch ready