feat: add version in CLI

[adriantam]

Description

Allow printing out of version in CLI

adriantam@C02F5002MD6P openfga % ./openfga
A high performance and flexible authorization/permission engine built for developers and inspired by Google Zanzibar.

OpenFGA is designed to make it easy for developers to model their application permissions, and to add and integrate fine-grained authorization into their applications.
Complete documentation is available at https://openfga.dev.

Usage:
  openfga [command]

Available Commands:
  completion  Generate the autocompletion script for the specified shell
  help        Help about any command
  migrate     Run database schema migrations needed for the OpenFGA server
  run         Run the OpenFGA server
  version     Return the OpenFGA version

Flags:
  -h, --help   help for openfga

Use "openfga [command] --help" for more information about a command.
adriantam@C02F5002MD6P openfga % ./openfga  version
2023/03/10 15:02:35 OpenFGA Version dev

References

N/A

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

[codecov]

Codecov Report

Patch coverage: 51.28% and project coverage change: -0.11 ⚠️

Comparison is base (42ecb9c) 84.32% compared to head (0511d4a) 84.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #625      +/-   ##
==========================================
- Coverage   84.32%   84.21%   -0.11%     
==========================================
  Files          86       87       +1     
  Lines       13647    13668      +21     
==========================================
+ Hits        11508    11511       +3     
- Misses       1759     1777      +18     
  Partials      380      380              

Impacted Files	Coverage Δ
cmd/openfga/main.go	0.00% <0.00%> (ø)
cmd/version.go	0.00% <0.00%> (ø)
pkg/testfixtures/storage/mysql.go	83.33% <75.00%> (-0.33%)	⬇️
pkg/testfixtures/storage/postgres.go	82.85% <75.00%> (-0.32%)	⬇️
pkg/typesystem/typesystem.go	86.28% <92.85%> (+0.21%)	⬆️
pkg/server/commands/write_authzmodel.go	90.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[jon-whit]

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