feat: tax exemption update

[inon-man]

Summary of changes

The implementation has been updated to not charge the tax at all for the addresses in the tax exemption list.

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]

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(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]

I have added an integration test to test the tax exemption on whole ante handler stack. It will check for amount change of:

1. fee collector
2. burn module
3. community pool
4. token supply

that should be all four important one

[nghuyenthevinh2000]

I will just add another script to make sure

[edk208]

lgtm