feat: denommetadata module hook for denom creation and update

[srene]

Description

This PR implements the hooks for the denommetadata module to communicate the denom metadata creation and update events

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Closes #659

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.

[codecov]

Codecov Report

Attention: Patch coverage is 47.82609% with 36 lines in your changes are missing coverage. Please review.

Project coverage is 29.87%. Comparing base (a62000d) to head (4003aca).

Files	Patch %	Lines
x/denommetadata/keeper/keeper.go	61.11%	12 Missing and 2 partials ⚠️
x/denommetadata/types/hooks.go	25.00%	10 Missing and 2 partials ⚠️
x/denommetadata/proposal_handler.go	11.11%	8 Missing ⚠️
x/denommetadata/module.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #664      +/-   ##
==========================================
+ Coverage   29.82%   29.87%   +0.04%     
==========================================
  Files         223      225       +2     
  Lines       31805    31861      +56     
==========================================
+ Hits         9487     9517      +30     
- Misses      20833    20855      +22     
- Partials     1485     1489       +4     

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