Bridges: Add missing initial primitives for AssetHub bridging (paritytech#8138)

This adds missing initial primitives to add CLI support for AssetHub
Bridging
earlier PR - paritytech#8063
source PR - paritytech#6675

It adds constants required to make this
[PR](paritytech/parity-bridges-common#3136 (comment))
build.

- [x] Make
[PR](paritytech/parity-bridges-common#3136)
build successful with these changes before merging

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Co-authored-by: Branislav Kontur <bkontur@gmail.com>
Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: 3 people