Pair, array, bytes, string and record builtins -- enhance all "constructor" functions to allow specifying the resulting's object mutability

[cipriancraciun]

Tasks

• update all direct callers for:

  • pair_new;
  • array_new;
  • string_new;
  • bytes_new;
  • record_new;
  • serde_*;

• update all primitives to pass an use-default as the default mutability:

  • pairs;
  • arrays;
  • strings;
  • bytes;
  • records;

• implement new (or adapt existing) primitives that allow to explicitly state the mutability:

  • pairs;
    • make-pair;
    • make-list;
    • ...
  • arrays;
    • make-vector;
    • ...
  • strings;
    • make-string;
    • ...
  • bytes;
    • make-bytevector;
    • ...
  • records;
    • ...