Validation for asset id when creating a new asset on AssetHub

[KarimJedda]

When creating a new asset, the assetID field should default to the next possible asset_id

• I'm submitting a ...

  • Bug report
  • Feature request
  • Support request
  • Other

• What is the current behavior and expected behavior?

The current UI makes it seem that any asset id would work, but after a runtime upgrade it is required that newly created asset id's follow a specific rule: the newly created asset's id should be the next possible id of the last created asset.

In other terms, next_asset_id = previous_asset_id + 1

• What is the motivation for changing the behavior?

Without this change, users will face this error:

• Please tell us about your environment:

  • Version:

  • Environment:

    • Node.js
    • Browser / Polkadot JS Apps
    • Other (limited support for other environments)

[polkadot-js-bot]

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