[XCM] Multiple `FungiblesAdapter`s support + `WeightTrader::buy_weight` more accurate error (#6739)

* Change ParaId->Sibling for `SiblingParachainConvertsVia`

* [XCM] Multiple `FungiblesAdapter`s support + `WeightTrader::buy_weight` more accurate error

* Added test for `ConvertedConcreteId` with `AsPrefixedGeneralIndex`

* Solution 3. - new MatchedConvertedConcreteId with matching capabilities

* Review fixes

* Renamed `AssetNotFound` -> `AssetNotHandled`

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Co-authored-by: parity-processbot <>