Add the tile datatype information

This small PR just add the datatype field into the CHAM_tile_t structure in order to prepare the field for mixed precision algorithms

added Feature label

requested review from @agullo

assigned to @faverge

added 5 commits

• efb55e63...5ffead0f - 4 commits from branch solverstack:master
• 7e7c3a11 - descriptor: Add a dtype typ in the CHAM_tile_t structure to hold the precision of the tile

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added 1 commit

• bce9465b - descriptor: Add a dtype typ in the CHAM_tile_t structure to hold the precision of the tile

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added 5 commits

• bce9465b...5ffead0f - 4 commits from branch solverstack:master
• f46df7b0 - descriptor: Add a dtype typ in the CHAM_tile_t structure to hold the precision of the tile

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approved this merge request

changed milestone to %Chameleon 1.3.0

mentioned in commit dae9f993

merged