Implement pallet_xcm_core_buyer #2836

Job	Run time
set-tags	4s
check-copyright	4s
cargo-toml-feature-propagation	1m 49s
cargo-clippy	5m 22s
toml-formatting	1m 1s
build	12m 49s
typescript-linting	16s
typescript-formatting	20s
rust-test	9m 44s
check-api-augment	1m 0s
typescript-dancebox-specs	23s
typescript-tests	5m 41s
typescript-tests-flashbox	3m 21s
typescript-tests-frontier	5m 8s
typescript-tests-simple-template	2m 40s
zombienet-tests	11m 51s
chopsticks-upgrade-test (stagenet_dancebox, dancebox)	58s
zombienet-tests-parathreads	10m 29s
chopsticks-upgrade-test (flashbox, flashbox)	49s
zombienet-tests-rotation	9m 8s
chopsticks-upgrade-test (dancebox, dancebox)	45s
zombienet-tests-warp-sync	7m 16s
chopsticks-upgrade-test (frontier_template, container-chain-template-frontier)	58s
docker-tanssi (tanssi)	41s
zombienet-test-upgrade (dancebox)	3m 56s
docker-tanssi (container-chain-simple-template)	37s
docker-tanssi (container-chain-evm-template)	41s
	1h 37m 51s

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