Epoch hooks, panic recovery

[ValarDragon]

What is the purpose of the change

This PR aims to mitigate the risk of a panic within the epoch logic causing a chain halt (or even a halt of subsequent epoch actions). A subcomponent of #1305

Brief change log

• Add panic recovery to the epoch hooks
• Improve the panic recovery -> string printing mechanism

Testing and Verifying

• This adds a test case to ensure that: Panics are actually caught in an x/epochs/hooks_test.go

We still need to test that this does not notably increase the epoch time. (Due to cosmos/cosmos-sdk#10310 )

I want to understand that issue better, but it may be that the best way to test it is to get this cherry-picked on a v7 branch and just run it.

Documentation and Release Note

• Does this pull request introduce a new feature or user-facing behavior changes? yes
• Is a relevant changelog entry added to the Unreleased section in CHANGELOG.md? yes
• How is the feature or change documented? specification (x/<module>/spec/), this still needs to be done

[codecov-commenter]

Codecov Report

Merging #1308 (44f0c83) into main (0b3e383) will decrease coverage by 0.45%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1308      +/-   ##
==========================================
- Coverage   20.26%   19.81%   -0.46%     
==========================================
  Files         203      210       +7     
  Lines       26824    27884    +1060     
==========================================
+ Hits         5436     5525      +89     
- Misses      20378    21333     +955     
- Partials     1010     1026      +16     

Impacted Files	Coverage Δ
x/epochs/types/hooks.go	100.00% <100.00%> (ø)
x/epochs/types/genesis.pb.go	11.13% <0.00%> (ø)
x/epochs/types/genesis.go	67.85% <0.00%> (ø)
x/epochs/types/identifier.go	33.33% <0.00%> (ø)
x/epochs/types/keys.go	0.00% <0.00%> (ø)
x/epochs/types/query.pb.gw.go	0.00% <0.00%> (ø)
x/epochs/types/query.pb.go	1.49% <0.00%> (ø)

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[p0mvn]

LGTM.

How are we going to handle panics which authors did not mean to be recoverable?

ref: #1305 (comment)

[ValarDragon]

How are we going to handle panics which authors did not mean to be recoverable?

Replied in the github issue. I think were right now assuming that none of the epoch code is deliberately chosen to cause a chain halt. (Reward distribution, token minting, superfluid, txfees)