[SYSTEMDS-???] CharArray Primitive #1761
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This commit adds a CharArray primitive to the FrameBlock columns. The char array is used in cases where there is a column in frame blocks with a single character in each cell. This overall reduce the allocation cost of each value from a full Object + pointer + Array pointer, to a simple char. Some design decisions include that if a int column is changed into a char column the bit encoding is prioritized rather than similar character. For instance the value 0 of an int is ' ' char that is the first char, and it is bitwise the same value (just with less bits.). If a string is converted then "0" becomes the char value 42.
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