[Expression] Allow negative value for vertex index in angle_at_vertex/distance_at_vertex/point_n... functions

[qgib]

Author Name: Harrissou Santanna (@DelazJ)
Original Redmine Issue: 21284

Redmine category:expressions
Assignee: Mathieu Pellerin - nIRV

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It could be nice that distance_to_vertex($geometry, -1) returns the length of the feature instead of -1 or point_n($geometry, -1) returns the last node. I know there are special functions for the examples I provide but it's more about generally allowing negative indices in these functions.
It will align them with array manipulations as well as options offered in Processing dialogs (Extract specific vertices eg).

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Related issue(s): #29100 (relates)
Redmine related issue(s): 21282

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[qgib]

Author Name: Harrissou Santanna (@DelazJ)

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• relates was configured as [Expression] point_n function should be coherent with other vertex based functions and algorithms #29100

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)

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• resolution was changed from to fixed/implemented
• assigned_to_id was configured as Mathieu Pellerin - nIRV

[qgib]

Author Name: Harrissou Santanna (@DelazJ)

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• status_id was changed from Open to Closed