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ARROW-11111: [GLib] Add GArrowFixedSizeBinaryArrayBuilder

The following functions are also added:

  * garrow_fixed_size_binary_array_new()
  * garrow_fixed_size_binary_array_get_byte_width()
  * garrow_fixed_size_binary_array_get_value()
  * garrow_fixed_size_binary_array_get_values_bytes()
  * garrow_decimal128_array_builder_append_values()
  * garrow_decimal256_array_builder_append_values()
  * garrow_decimal128_to_bytes()
  * garrow_decimal256_to_bytes()

Closes #9082 from kou/glib-fixed-size-binary-array-builder

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>