[encointer] introduce collator selection and send fees to authors instead of treasury

[brenzi]

closes #183
closes #176
closes #146 (should be closed already, but this PR adds more)

This PR aligns collator selection and fee distribution logic of Encointer with other system chains and thereby is a small step towards self-sustainability of infrastructure

• remove treasury (and leave negligible funds on trsry account)
• add collator-selection, session and authorship pallets
• instead of burning fees in community currency , send them to block authors like native KSM
• remove DMP queue pallet (pure cleanup, no change in functionality)
• add migration to inject existing collators as invulnerables
• remove applied migrations from release 1.2.0

steps to reproduce the new fee logic: https://gist.github.com/brenzi/ca9e0c326198c73ff2dd0a2e74468053

[brenzi]

darn. that was a mistake...

[brenzi]

I would claim your feedback up to this point has been addressed @joepetrowski. thanks a lot for your hints

[joepetrowski]

KSM does go to the Staking Pot as expected:
https://gist.github.com/brenzi/ca9e0c326198c73ff2dd0a2e74468053#file-gistfile1-txt-L50-L64

[brenzi]

/merge

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[acatangiu]

/merge

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[brenzi]

happy to announce the migration worked smoothly on rococo and the session pallet works as expected:

notice the author's appearing after the upgrade

migration log

May 22 18:58:18 ero-collator-02 encointer-collator[3797498]: 2024-05-22 18:58:18.173  INFO tokio-runtime-worker runtime::frame-support: [Parachain] 🐥 New pallet "Authorship" detected in the runtime. The pallet has no defined storage version, so the on-chain version is being initialized to StorageVersio>
May 22 18:58:18 ero-collator-02 encointer-collator[3797498]: 2024-05-22 18:58:18.174  INFO tokio-runtime-worker runtime::frame-support: [Parachain] 🐥 New pallet "CollatorSelection" detected in the runtime. Initializing the on-chain storage version to match the storage version defined in the pallet: Sto>
May 22 18:58:18 ero-collator-02 encointer-collator[3797498]: 2024-05-22 18:58:18.174  INFO tokio-runtime-worker runtime::frame-support: [Parachain] 🐥 New pallet "Session" detected in the runtime. Initializing the on-chain storage version to match the storage version defined in the pallet: StorageVersio>
May 22 18:58:18 ero-collator-02 encointer-collator[3797498]: 2024-05-22 18:58:18.180  INFO tokio-runtime-worker frame_support::migrations: [Parachain] Removed 1 DmpQueue keys 🧹
May 22 18:58:18 ero-collator-02 encointer-collator[3797498]: 2024-05-22 18:58:18.180  INFO tokio-runtime-worker runtime::fix::collator_selection_init: [Parachain] initializing the set of invulnerables