Migrate Hydro & Tribute contracts to v2.0.1

[dusan-maksimovic]

Description

This PR adds migration for Hydro and Tribute smart contracts from V1.1 to V2.0.1. The following states of the SCs are migrated, per PRs:

• Fractional voting support (Fractional voting support #157)

  • Hydro SC:
    • VOTE_MAP key includes lock ID
      • migrate existing votes by iterating over users that voted and their lockups
    • Vote struct is modified- doesn't contain HashMap anymore, but only one validator->shares

• Custom bids duration (Custom bids duration #165)

  • Hydro SC:
    • "max_bid_duration" added to Constants
      • set through MigrateMsg
    • "bid_duration" added to Proposal
      • set to 1 in round 0 proposals

• Add a minimum export floor (Add a minimum export floor #162)

  • Hydro SC:
    • "minimum_atom_liquidity_request" added to Proposal
      • set to 0 for round 0 proposals
  • Tribute SC:
    • "top_n_props_count" and "min_prop_percent_for_claimable_tributes" removed from Config

• Allow tributes for proposals in past rounds (Allow tributes for proposals in past rounds #147)

  • Tribute SC:
    • "creation_time" and "creation_round" added to Tributes
      • will be set to the timestamp of the beginning of that round and the round in which tribute was created

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Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• Targeted the correct branch
• Included the necessary unit tests
• Added/adjusted the necessary interchain tests
• Added a changelog entry in .changelog
• Compiled the contracts by using make compile and included content of the artifacts directory into the PR
• Regenerated front-end schema by using make schema and included generated files into the PR
• Updated the relevant documentation or specification
• Reviewed "Files changed" and left comments if necessary
• Confirmed all CI checks have passed

[stana-miric]

LGTM!