feat(examples): add p/jeronimoalbi/pager package

[jeronimoalbi]

Package implements a way to support paging in generic cases that don't use an AVL trees.

[Gno2D2]

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[leohhhn]

Please check if we also handle gnoweb args properly, ie $help, $source

[moul]

Related with #3414

(I'll make sure to link your implementation from mine)

[jeronimoalbi]

Please check if we also handle gnoweb args properly, ie $help, $source

@leohhhn special Gnoweb args are filtered before the Render so they don't get to the render path, it can be tested using gno.land/r/demo/echo realm

[jeronimoalbi]

Addressing comments 👍