Add data conversion map for low bit datatypes

aidge_export_arm_cortexm/data_conversion.py

+import aidge_core
+
+from typing import Dict
+
+datatype_converter_aidge2arm: Dict[aidge_core.dtype, str]  = {
+    aidge_core.dtype.float64    : "data<-64>",
+    aidge_core.dtype.float32    : "data<-32>",
+
+    aidge_core.dtype.int32      : "data<32>",
+    aidge_core.dtype.int16      : "data<16>",
+    aidge_core.dtype.int8       : "data<8>",
+    aidge_core.dtype.uint32     : "udata<32>",
+    aidge_core.dtype.uint16     : "udata<16>",
+    aidge_core.dtype.uint8      : "udata<8>",
+    
+    # Integer type without weightinterleaving
+    # aidge_core.dtype.int7       : "data<8>",
+    # aidge_core.dtype.int6       : "data<8>",
+    # aidge_core.dtype.int5       : "data<8>",
+    aidge_core.dtype.int4       : "data<8>",
+    aidge_core.dtype.int3       : "data<8>",
+    aidge_core.dtype.int2       : "data<8>",
+    aidge_core.dtype.binary     : "data<8>",
+        
+    # aidge_core.dtype.uint7      : "udata<8>",
+    # aidge_core.dtype.uint6      : "udata<8>",
+    # aidge_core.dtype.uint5      : "udata<8>",
+    aidge_core.dtype.uint4      : "udata<8>", 
+    aidge_core.dtype.uint3      : "udata<8>",
+    aidge_core.dtype.uint2      : "udata<8>", 
+    
+    # Integer type with weightinterleaving
+    aidge_core.dtype.dual_int4       : "data<4>",
+    aidge_core.dtype.dual_int3       : "data<3>",
+    aidge_core.dtype.quad_int2       : "data<2>",
+    aidge_core.dtype.octo_binary     : "data<1>",
+
+    aidge_core.dtype.dual_uint4       : "udata<4>",
+    aidge_core.dtype.dual_uint3       : "udata<3>",
+    aidge_core.dtype.quad_uint2       : "udata<2>",
+}
+