fix: burn tax split bug

[inon-man]

Summary of changes

This PR is a bug fix for the Burn Tax Split feature.

The current Burn Tax Split feature does not transfer the community pool amount from the fee collector to the treasury, so the total supply and remaining amount of the fee collector are not accurately calculated.

For example:

1. Where
   total supply = 100
   fee collector = 100
   burn tax rate = 0.4
2. In the AnteHandler
   split amount = fee collector * burn tax rate = 40
   community pool += split amount // fee collector sends 40 to community pool
   burn += fee collector - split amount // fee collector sends 60 to burn account
   fee collector = 0
   total supply = 40

This PR also included removal of TaxPowerSplitHeight as they are no longer needed in v2.x

Report of required housekeeping

• Github issue OR spec proposal link
• Wrote tests
• Updated API documentation (client/lcd/swagger-ui/swagger.yaml)
• Added a relevant changelog entry: clog add [section] [stanza] [message]

---

(FOR ADMIN) Before merging

• Added appropriate labels to PR
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)
• Confirm added tests are consistent with the intended behavior of changes
• Ensure all tests pass

[nghuyenthevinh2000]

[ZaradarBH]

LGTM :)

[ZaradarBH]

FML your fast! Beat me by like 3 mins. LGTM buddy, I think this is the cleanest solution :)

[ZaradarBH]

#proof-of-trying-to-code-faster-then-superman (at least I lived to tell the tale :D)

[ZaradarBH]

LGTM :)