feature(ui-ux): add new tokens and dtokens for matic, sol, and dot

[chloezxyy]

What this PR does / why we need it:

As titled. Add tokens icon symbols to the /tokens and /proof-of-backing tables - once data is available on-chain, the added tokens will be reflected in the tables.

Backing table:

Which issue(s) does this PR fixes?:

Fixes #

Sample Links & Screenshots:

Link:

Desktop Screenshot

Mobile Screenshot

Additional comments?:

Developer Checklist:

• [ ] Read your code changes at least once
• [ ] Tested on multiple web browsers
• [ ] Tested responsiveness (e.g, iPhone, iPad, Desktop)
• [ ] No console errors
• [ ] Unit tests*
• [ ] Added e2e tests*

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