feat(boards2): pagination

[x1unix]

Implement pagination for boards, threads and replies.

Closes #3200

CC @jeronimoalbi @salmad3

[Gno2D2]

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[jeronimoalbi]

Suggested change

	func mustGetPagination(req *mux.Request, pageSize int) *PaginationOpts {
	p := pager.Pager{
	PageQueryParam: "page",
	DefaultPageSize: pageSize,
	}
	pageNumber, _, err := p.ParseQuery(req.RawPath)
	if err != nil {
	panic(err)
	}
	return &PaginationOpts{
	Pager: p,
	PageNumber: pageNumber,
	}
	}
	func mustGetPagination(rawPath string, pageSize int) *PaginationOpts {
	p := pager.Pager{
	PageQueryParam: "page",
	DefaultPageSize: pageSize,
	}
	pageNumber, _, err := p.ParseQuery(rawPath)
	if err != nil {
	panic(err)
	}
	return &PaginationOpts{
	Pager: p,
	PageNumber: pageNumber,
	}
	}

[jeronimoalbi]

Suggested change

	p := mustGetPagination(req, boardsPageSize)
	p := mustGetPagination(req.RawPath, boardsPageSize)

[jeronimoalbi]

Suggested change

	p := mustGetPagination(req, threadsPageSize)
	p := mustGetPagination(req.RawPath, threadsPageSize)

[jeronimoalbi]

Suggested change

	p := mustGetPagination(req, repliesPageSize)
	p := mustGetPagination(req.RawPath, repliesPageSize)

[jeronimoalbi]

Should Pager and PageNumber be public? What do you think about making them private?

Also PageNumber could be removed I think, because is available as Pager.PageNumber.

[jeronimoalbi]

Maybe, it might be possible to use a struct instead of a pointer everywhere when using PaginationOpts as argument:

Suggested change

	func (board *Board) Render(p *PaginationOpts) string {
	func (board *Board) Render(p PaginationOpts) string {