Created option for 'Pager Load More' and settings in Views UI.

Arpit kayarerequested to merge
issue/pager_load_more-3317044:3317044-create-view-setting-option into 1.0.x

Closes #3317044Pager_load_more-3317043Pager_load_more-3317043-2Pager_load_more-3317043-3

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