feat: add go fmt to make fmt command

[MSevey]

Overview

Closes #223

Instead of adding a formatted to the CI, which would introduce a diff that would need to be committed, I extended the make fmt command.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.38% ⚠️

Comparison is base (472f245) 56.08% compared to head (30e2a49) 55.71%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1178      +/-   ##
==========================================
- Coverage   56.08%   55.71%   -0.38%     
==========================================
  Files          63       63              
  Lines        6711     6711              
==========================================
- Hits         3764     3739      -25     
- Misses       2560     2583      +23     
- Partials      387      389       +2     

see 3 files with indirect coverage changes

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[gupadhyaya]

@MSevey can we inherit from app or node?
e.g., node uses gofmt, goimports along with markdownlint https://github.com/celestiaorg/celestia-node/blob/main/Makefile#L83
app just uses golangci-lint with --fix: https://github.com/celestiaorg/celestia-app/blob/main/Makefile#L93

either we can just do @golangci-lint run --fix or combination of gofmt and goimports like node does. i prefer earlier as I used it in the past.

[MSevey]

@MSevey can we inherit from app or node? e.g., node uses gofmt, goimports along with markdownlint https://github.com/celestiaorg/celestia-node/blob/main/Makefile#L83 app just uses golangci-lint with --fix: https://github.com/celestiaorg/celestia-app/blob/main/Makefile#L93

either we can just do @golangci-lint run --fix or combination of gofmt and goimports like node does. i prefer earlier as I used it in the past.

I don't think we can inherit another repo's makefile in a clean way. But happy to use the golangci-lint --fix flag 👍