refactor!: Rename Lend to Supply

[toteki]

Lots of renaming here - the word "lend" no longer appears except in old changelogs and the phrase "lending pool".

The major API breaks:

• MsgLendAsset -> MsgSupply
• QueryLoaned -> QuerySupplied (and total loaned, other queries)
• LendAPY -> SupplyAPY
• Field name Lender -> Supplier field in some places

If looking for API breaking changes, view the proto file diffs first.

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[codecov-commenter]

Codecov Report

Merging #1106 (e321079) into main (dc5a0c0) will not change coverage.
The diff coverage is 34.23%.

@@           Coverage Diff           @@
##             main    #1106   +/-   ##
=======================================
  Coverage   43.54%   43.54%           
=======================================
  Files          65       65           
  Lines        8336     8336           
=======================================
  Hits         3630     3630           
  Misses       4456     4456           
  Partials      250      250           

Impacted Files	Coverage Δ
x/leverage/client/cli/query.go	0.00% <0.00%> (ø)
x/leverage/client/cli/tx.go	0.00% <0.00%> (ø)
x/leverage/keeper/grpc_query.go	5.77% <0.00%> (ø)
x/leverage/keeper/loaned.go	0.00% <0.00%> (ø)
x/leverage/keeper/msg_server.go	0.84% <0.00%> (ø)
x/leverage/types/query.pb.gw.go	0.00% <0.00%> (ø)
x/leverage/types/tx.go	0.00% <0.00%> (ø)
x/leverage/types/token.go	35.59% <40.00%> (ø)
x/leverage/keeper/invariants.go	57.57% <50.00%> (ø)
x/leverage/types/codec.go	41.93% <50.00%> (ø)
... and 6 more

[toteki]

Massive diff - just finished combing through the files manually.

The other proto rename PRs won't be like this. This one requires a change in vocabulary in the docs.

[robert-zaremba]

Approving, but left some comments and suggestions (could be applied to other places).
Moreover in some place we should add more context because supply is very general (eg: "for lending or collateral")