feat(rollapp): min bond is now defined on rollapp level

[danwt]

Description

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Closes #1577

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

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For Reviewer:

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

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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.

[omritoptix]

nice work!
however I blv we should keep the min bond.
we can always set it to 0 at some point if we wish but I think it's good to start with sane min bond to protect unexperienced creators and maybe will change it later on.

[omritoptix]

@danwt I think we also need migration for this (as on mainnet it's defined now on global level).
we can do that in this pr or a separate one.

[codecov]

Codecov Report

Attention: Patch coverage is 39.31889% with 196 lines in your changes missing coverage. Please review.

Project coverage is 22.59%. Comparing base (0988440) to head (af2e167).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
x/rollapp/types/tx.pb.go	19.04%	77 Missing and 8 partials ⚠️
x/rollapp/types/params.pb.go	0.00%	47 Missing ⚠️
x/rollapp/types/rollapp.pb.go	47.27%	21 Missing and 8 partials ⚠️
x/rollapp/client/cli/tx_update_rollapp.go	18.18%	9 Missing ⚠️
x/rollapp/client/cli/tx_create_rollapp.go	30.00%	5 Missing and 2 partials ⚠️
x/rollapp/keeper/bond.go	75.00%	2 Missing and 1 partial ⚠️
x/rollapp/keeper/msg_server_create_rollapp.go	0.00%	2 Missing and 1 partial ⚠️
x/rollapp/types/bond.go	83.33%	2 Missing and 1 partial ⚠️
x/rollapp/types/params.go	75.00%	2 Missing and 1 partial ⚠️
x/sequencer/keeper/invariants.go	25.00%	3 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1579      +/-   ##
==========================================
- Coverage   22.61%   22.59%   -0.02%     
==========================================
  Files         577      590      +13     
  Lines      127061   127609     +548     
==========================================
+ Hits        28729    28829     +100     
- Misses      94477    94911     +434     
- Partials     3855     3869      +14     

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[VictorTrustyDev]

utACK LGTM!

[danwt]

@mtsitrin I'm considering your comments to be nits but I will change the param to adym