Revert "[Assets] Implement pallet-assets-holder (#4530)"

[gui1117]

This reverts commit 83db047.

Sorry, I pushed the merge button before the audit of the PR, this reverts the commit.

For backport for 2503 see: #7616

[bkchr]

I don't think we need to revert this. This is an extra pallet and if it is not used, there is no security issue with it.

[gui1117]

I don't think we need to revert this. This is an extra pallet and if it is not used, there is no security issue with it.

It adds change in pallet-assets: substrate/frame/assets/src/functions.rs
The calculation of freezing is changed, with this PR it is now respecting the documentation in fungibles: ED is included in the frozen amount: so if Alice have 10 DOT and ED is 1 and frozen is 4 then before the PR spendable amount is 5, after the PR spendable amount is 4.

cc @muharem

[gui1117]

Maybe we can have an audit only for the change in substrate/frame/assets/src/functions.rs and we can expect it before 2503 release.

[bkchr]

Maybe we can have an audit only for the change in substrate/frame/assets/src/functions.rs and we can expect it before 2503 release.

As said in the backport pr, let's revert it in the 2503 release.