feat: market-data slice improvements

[gomesalexandre]

Description

This PR removes findByAssetIds and findPriceHistoryByAssetIds endpoints in profit of findByAssetId and findPriceHistoryByAssetId.

This ensures:

• better ergonomics (i.e many many places we were passing an array of single AssetId)
• most importantly, better performance. See Infinite loop on buy-crypto route #7599, which, while it is an extreme case, would've been somehow mitigated to some extent by leveraging the caching of previous market-data RTK queries.
  The reason is RTK query args are shallow compared, and having the same AssetId in different assetIds[] args between runs means market-data will be refetched. By fetching one vs. many, we avoid this and ensure caching works as it should.

Issue (if applicable)

N/A, though relates to the closed #7599

Risk

High Risk PRs Require 2 approvals

What protocols, transaction types, wallets or contract interactions might be affected by this PR?

Low, but effectively medium given the surface area. See testing steps.

Testing

Ensure market-data is happy across the app:

• Dashboard
• Assets Page
• Asset Page
• Account Asset Page
• Swapper
• Fiat ramps
• DeFi, Lending, LP, RFOX

Engineering

• ^

Operations

• 🏁 My feature is behind a flag and doesn't require operations testing (yet)

• ^

Screenshots (if applicable)

https://jam.dev/c/464026f7-308e-4061-b94a-b1cd54a609f3

[NeOMakinG]

Looks good so far!

[NeOMakinG]

https://jam.dev/c/1b765ee4-5c79-44e1-9107-c64dd3ffb685

Couldn't find any regression, nice job!