Move command-specific flags into command source file

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d35d751) 50.05% compared to head (d1a5755) 50.05%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #407 +/- ## ======================================= Coverage 50.05% 50.05% ======================================= Files 61 61 Lines 5022 5022 ======================================= Hits 2514 2514 Misses 2190 2190 Partials 318 318 ``` | [Files Changed](https://app.codecov.io/gh/ipni/index-provider/pull/407?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ipni) | Coverage Δ | | |---|---|---| | [cmd/provider/announce.go](https://app.codecov.io/gh/ipni/index-provider/pull/407?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ipni#diff-Y21kL3Byb3ZpZGVyL2Fubm91bmNlLmdv) | `0.00% <ø> (ø)` | | | [cmd/provider/connect.go](https://app.codecov.io/gh/ipni/index-provider/pull/407?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ipni#diff-Y21kL3Byb3ZpZGVyL2Nvbm5lY3QuZ28=) | `0.00% <ø> (ø)` | | | [cmd/provider/daemon.go](https://app.codecov.io/gh/ipni/index-provider/pull/407?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ipni#diff-Y21kL3Byb3ZpZGVyL2RhZW1vbi5nbw==) | `0.00% <ø> (ø)` | | | [cmd/provider/import.go](https://app.codecov.io/gh/ipni/index-provider/pull/407?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ipni#diff-Y21kL3Byb3ZpZGVyL2ltcG9ydC5nbw==) | `0.00% <ø> (ø)` | | | [cmd/provider/index.go](https://app.codecov.io/gh/ipni/index-provider/pull/407?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ipni#diff-Y21kL3Byb3ZpZGVyL2luZGV4Lmdv) | `0.00% <ø> (ø)` | | | [cmd/provider/init.go](https://app.codecov.io/gh/ipni/index-provider/pull/407?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ipni#diff-Y21kL3Byb3ZpZGVyL2luaXQuZ28=) | `0.00% <ø> (ø)` | | | [cmd/provider/remove.go](https://app.codecov.io/gh/ipni/index-provider/pull/407?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ipni#diff-Y21kL3Byb3ZpZGVyL3JlbW92ZS5nbw==) | `0.00% <ø> (ø)` | |

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