Expand Native Asset Docs

[bitzoic]

Description

• Additional docs covering Native Assets including:
  • EVM vs FuelVM Assets
  • What AssetId is
  • How to use AssetId
  • What SubId is
  • What the default asset is
  • How to mint coins
  • How to burn coins
  • How to transfer coins
  • How to check contract balances
  • How to check transaction values
  • How to receive assets in contracts
  • ERC-20 equivalent example
  • ERC-1155 equivalent example
• The Liquidity Pool example has been moved to its own section in examples

These changes were originally included in #5806 but have been pulled out into a separate PR

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[sarahschwartz]

Great job! I just left some nits

[K1-R1]

Looking good