feat(tangle-dapp): Compute Restaking TVL Values

[AtelyPham]

Summary of changes

Provide a detailed description of proposed changes.

• [x] Implement token price fetchers using Coinbase and CoinCap APIs.
• [x] Create placeholders for both single and multiple token price fetchers.
• [x] Calculate total network TVL and self-restake TVL for the restaking overview page.
• [x] Determine TVL for vaults.
• [x] Calculate TVL for operators.
• [x] Assess operator concentration based on their TVLs.

Proposed area of change

Put an x in the boxes that apply.

• [ ] apps/bridge-dapp
• [ ] apps/hubble-stats
• [ ] apps/stats-dapp
• [x] apps/tangle-dapp
• [ ] apps/testnet-leaderboard
• [ ] apps/faucet
• [ ] apps/zk-explorer
• [ ] libs/webb-ui-components

Reference issue to close (if applicable)

Specify any issues that can be closed from these changes (e.g. Closes #233).

• Closes https://github.com/webb-tools/webb-dapp/issues/2529

Screen Recording

If possible provide a screen recording of proposed change.

https://github.com/user-attachments/assets/575474b1-542b-41f0-b6f1-09a949c38841

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