[Malleability] BlocksByCollection

[UlyanaAndrukhiv]

Fix implementations of Entity and IDEntity so that it covers dynamic data too

[illia-malachyn]

Neither Entity nor IDEntity covers all fields.

BlocksByCollection is used in herocache. That's why it implements Entity and IDEntity. However, it uses only collectionID to uniquely identify an object of the type. It looks like a misuse.

I'm moving it to #6646 epic.

flow-go/module/mempool/stdmap/blockbycollections.go

Lines 32 to 35 in 8c170e3

	func (b *BlockByCollections) Get(collID flow.Identifier) (*entity.BlocksByCollection, bool) {
	backdata := &BlockByCollectionBackdata{b.backData}
	return backdata.ByID(collID)
	}