feat: gov proposal for rollapp fraud event

[mtsitrin]

Description

---

Closes #615

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.

PR review checkboxes:

I have...

• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Targeted PR against the correct branch
• included the correct type prefix in the PR title
• Linked to the GitHub issue with discussion and accepted design
• Targets only one GitHub issue
• Wrote unit and integration tests
• Wrote relevant migration scripts if necessary
• All CI checks have passed
• Added relevant godoc comments
• Updated the scripts for local run, e.g genesis_config_commands.sh if the PR changes parameters
• Add an issue in the e2e-tests repo if necessary

SDK Checklist

• Import/Export Genesis
• Registered Invariants
• Registered Events
• Updated openapi.yaml
• No usage of go map
• No usage of time.Now()
• Used fixed point arithmetic and not float arithmetic
• Avoid panicking in Begin/End block as much as possible
• No unexpected math Overflow
• Used sendCoin and not SendCoins
• Out-of-block compute is bounded
• No serialized ID at the end of store keys
• UInt to byte conversion should use BigEndian

Full security checklist here

----;

For Reviewer:

• Confirmed the correct type prefix in the PR title
• Reviewers assigned
• Confirmed all author checklist items have been addressed

---;

After reviewer approval:

• In case the PR targets the main branch, PR should not be squash merge in order to keep meaningful git history.
• In case the PR targets a release branch, PR must be rebased.

[codecov]

Codecov Report

Attention: Patch coverage is 4.35484% with 593 lines in your changes are missing coverage. Please review.

Project coverage is 29.87%. Comparing base (d447bab) to head (9754a8a).

Files	Patch %	Lines
x/rollapp/types/proposal.pb.go	0.67%	439 Missing ⚠️
x/rollapp/keeper/fraud_proposal.go	0.00%	39 Missing ⚠️
x/rollapp/client/cli/tx_submit_fraud_proposal.go	0.00%	34 Missing ⚠️
x/rollapp/types/proposal_submit_fraud.go	5.71%	33 Missing ⚠️
x/sequencer/keeper/hook_listener.go	13.33%	13 Missing ⚠️
x/rollapp/proposal_handler.go	7.69%	11 Missing and 1 partial ⚠️
utils/client_utils.go	0.00%	10 Missing ⚠️
x/rollapp/types/hooks.go	0.00%	6 Missing ⚠️
x/delayedack/hooks.go	0.00%	3 Missing ⚠️
x/streamer/client/cli/tx_create_stream.go	0.00%	1 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #622      +/-   ##
==========================================
- Coverage   30.43%   29.87%   -0.57%     
==========================================
  Files         201      207       +6     
  Lines       28573    29167     +594     
==========================================
+ Hits         8697     8713      +16     
- Misses      18523    19100     +577     
- Partials     1353     1354       +1     

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[omritoptix]

looks good. you have a typo in the file name you copied from the streamer: x/rollapp/types/proposal_stream.go