fix: fix x/tokenfactory genesis import denoms reset x/bank existing denom metadata

[dadamu]

What is the purpose of the change

This pull request fixes the x/tokenfactory genesis import reset x/bank existing denom metadata, say, x/bank genesis has the metadata of facotory/osmos1.../testtoken with {Display: test}, x/tokenfactory init genesis phase will replace it with the empty disply, more details as follows:

Before x/tokenfactory init genesis, the x/bank set metadata as:

{
  Name:        "Mint Token",
  Symbol:      "MTK",
  Description: "The custom token of the test subspace.",
  DenomUnits: []*banktypes.DenomUnit{
	{Denom: "factory/cosmos1y54exmx84cqtasvjnskf9f63djuuj68p7hqf47/uminttoken", Exponent: uint32(0), Aliases: nil},
	{Denom: "minttoken", Exponent: uint32(6), Aliases: []string{"minttoken"}},
  },
  Base:    "factory/cosmos1y54exmx84cqtasvjnskf9f63djuuj68p7hqf47/uminttoken",
  Display: "minttoken",
}

After x/tokenfactory init genesis, the metadata is replaced into:

{
  DenomUnits: []*banktypes.DenomUnit{
	{Denom: "factory/cosmos1y54exmx84cqtasvjnskf9f63djuuj68p7hqf47/uminttoken", Exponent: uint32(0)},
  },
  Base:    "factory/cosmos1y54exmx84cqtasvjnskf9f63djuuj68p7hqf47/uminttoken",
}

Testing and Verifying

This change added tests and can be verified as follows:

• Added unit test that validates the x/bank imported metadata won't be reset by x/tokenfactory

Documentation and Release Note

• Does this pull request introduce a new feature or user-facing behavior changes?
• Changelog entry added to Unreleased section of CHANGELOG.md?

Where is the change documented?

• Specification (x/{module}/README.md)
• Osmosis documentation site
• Code comments?
• N/A

[mattverse]

Thanks for the PR! Logic change lgtm, requesting some test additions before we can merge this

[mattverse]

Can unit tests for CreateDenom be added to confirm the new logic introduced as well?

[dadamu]

Added the unit test to check CreateDenom if the metadata is set correctly, the metadata existing case is already covered by this test

[mattverse]

@dadamu Would you also be able to add CHANGELOG entry?

[dadamu]

@mattverse Added the CHANGELOG entry

[mattverse]

LGTM, thanks for the PR!