[P<>K bridge] Permissionless dedicated bridge lanes

[acatangiu]

Description

Introduce a new "permissionless lanes" feature, which allows for the dynamic management of opening and closing lanes instead of the current method of hard-coding them in the source code.

Allows parachain teams to have dedicated point-to-point XCM channel between two sides of the bridge (option 2 in DotSama parachains options for using Polkadot<>Kusama bridge).

Progress

• Released in SDK and tested on testnets: [Bridges SDK] Permissionless dedicated bridge lanes paritytech/polkadot-sdk#6044
• integrate stable2409 to Polkadot and Kusama system chain runtimes
• live on Kusama and Polkadot system chains

Deployment plan

Bridges: Permissionless Lanes deployment.