feat(boards2): pagination

[x1unix]

Implement pagination for boards, threads and replies.

Closes #3200, #3539

CC @jeronimoalbi @salmad3

[Gno2D2]

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[jeronimoalbi]

This should be optional because p could be nil. Shouldn't we make sure not to render pager when p == nil?

[x1unix]

@jeronimoalbi check content of p.Iterate which is nil-safe actually.

https://goplay.tools/snippet/dBX1Td7u68w

func (opts *PaginationOpts) Iterate(tree *avl.Tree, cb func(k string, val interface{}) bool) *pager.Page {
	if opts == nil {
		tree.Iterate("", "", cb)
		return nil
	}
	
	....
}