Use BoundedVec's

[benoitdevos]

Content

• Enforce that all storage match MaxEncodedLen - essentially by replacing Vec with BoundedVec.
• Enable compilation without #[pallet::without_storage_info].
• Config has been completed with possibility to choose an actual bound for each BoundedVec.

⚠️ Attention points

• A migration is provided for info - it fails to complete within 2 sec and therefore should not be wired in the node.
• The configurable type MaxLocMetadata, MaxLocFiles and MaxLocLinks do require to implement TypeInfo (in the mock and the node, which is quite unusual). There is likely a cleaner way to achieve the same result (use another type ?).

parameter_types! {
	#[derive(TypeInfo)]
	pub const MaxLocMetadata: u32 = 50;
	#[derive(TypeInfo)]
	pub const MaxLocFiles: u32 = 50;
	#[derive(TypeInfo)]
	pub const MaxLocLinks: u32 = 50;
	...
} 

Out-of-scope

• IdentityLocLocsMap and OtherAccountLocsMap seem to be useless, as well as some other maps. The removal of those useless maps is out of the scope of the present PR, so they were updated to use BoundedVec - but not fully tested against overflow condition.
• The actual migration will be provided in a distinct PR.

logion-network/logion-internal#488

[gdethier]

Great job, thanks!