[FEATURE]: buildtest buildspec find --tag-count

[shahzebsiddiqui]

Please describe your feature request

The command buildtest buildspec find --tag-count can be used to report the total tag count which is unique tags. This information is already captured but one needs to run buildtest bc summary

(buildtest)  ~/Documents/github/buildtest/ [color_changes_buildtest_hy] buildtest bc summary
╭───────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│                                                                                                           │
│     Reading Buildspec Cache File:   /Users/siddiq90/Documents/github/buildtest/var/buildspecs/cache.json  │
│     Total Valid Buildspecs:         48                                                                    │
│     Total Invalid Buildspecs:       3                                                                     │
│     Total Unique Tags:              15                                                                    │
│     Total Maintainers:              3                                                                     │
│                                                                                                           │
╰───────────────────────────────────────────────────────────────────────────────────────────────────────────╯

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