Extend SubcommandsProvider

[imunproductive]

This PR extends SubcommandsProvider type to expose few methods to better iterate it.

@race-of-sloths include

[artob]

@race-of-sloths score 1

[race-of-sloths]

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Current status: executed

Reviewer	Score
@artob	1

Your contribution is much appreciated with a final score of 1!
You have received 30 (10 base + 20 weekly bonus) Sloth points for this contribution

@artob received 25 Sloth Points for reviewing and scoring this pull request.

Another weekly streak completed, well done @imunproductive! To keep your weekly streak and get another bonus make pull request next week! Looking forward to see you in race-of-sloths

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