Olympia. Runtime. Expose allowed lock ID combinations.

[shamil-gadelshin]

We need to expose allowed lock ID combinations to the frontend (#2825).

The are several approaches to implement this:

• an option using node RPC with rich functionality has its downsides: a necessity to force all nodes to be updated in case of the RPC change - imposing an additional hardfork demand that we generally should avoid because of the Substrate's softfork capabilities. Consult with @mnaamani on the details.
• I chose to expose the allowed lock combinations via the joystreamUtility pallet's constants. The constant name is AllowedLockCombinations. It returns the set of the allowed lock ID pairs.

Fixes:

• Expose compatible Locks API #2825
• Update locks handling #3087

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[shamil-gadelshin]

FYI @jodator

[jodator]

FYI @jodator

FYI @dmtrjsg – something for the Pioneer team to look into. Looks helpful :)

[mnaamani]

Looks good, just needs merge conflict fixes.