Add: s3hub subcommand entrypoint. all subcommnads are not implemented yet

[nao1215]

No description provided.

[github-actions]

HOTTEST report

PASS	FAIL	SKIP	TOTAL	DURATION
15	0	0	15	4.6579069s

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Reported by hottest

[github-actions]

Code Metrics Report

	main (9b1d5a3)	#5 (adfd5ed)	+/-
Coverage	100.0%	62.2%	-37.8%
Test Execution Time	4s	16s	+12s

Details

  |                     | main (9b1d5a3) | #5 (adfd5ed) |  +/-   |
  |---------------------|----------------|--------------|--------|
- | Coverage            |         100.0% |        62.2% | -37.8% |
  |   Files             |              1 |            8 |     +7 |
  |   Lines             |              6 |           37 |    +31 |
+ |   Covered           |              6 |           23 |    +17 |
- | Test Execution Time |             4s |          16s |   +12s |

Code coverage of files in pull request scope (0.0% → 54.8%)

Files	Coverage	+/-
cmd/subcmd/s3hub/cp.go	100.0%	+100.0%
cmd/subcmd/s3hub/interactive.go	100.0%	+100.0%
cmd/subcmd/s3hub/ls.go	100.0%	+100.0%
cmd/subcmd/s3hub/mb.go	100.0%	+100.0%
cmd/subcmd/s3hub/rm.go	100.0%	+100.0%
cmd/subcmd/s3hub/root.go	6.7%	+6.7%
cmd/subcmd/s3hub/version.go	100.0%	+100.0%

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Reported by octocov