Distinguishing attribute `numberSystem` is ignored.

Cldr::Export::Data::Numbers#symbols ignores the distinguishing attribute numberSystem:

Example

In the bn locale, there are data for two number systems. However, Cldr::Export::Data::Numbers#symbols merges them all together:

(byebug) select('numbers/symbols/*').size
23

23 = 11 from the beng numberSystem, and 12 from the latn numberSystem (CLDR v34)

The result is a set of symbols that combine bits of both numberSystems.

bn:
  numbers:
    symbols:
      alias: ''
      decimal: "."
      group: ","
      list: ";"
      percent_sign: "%"
      plus_sign: "+"
      minus_sign: "-"
      exponential: E
      superscripting_exponent: "×"
      per_mille: "‰"
      infinity: "∞"
      nan: NaN
      time_separator: ":"

Distinguishing attributes are used to distinguish multiple elements at the same level.

I expected different numberSystem elements to be kept separate during the export, since that's what the spec calls for. Something like:

bn:
  numbers:
    symbols:
      beng:
          ....
      latn:
          ....

Start with Cldr::Export::Data::Numbers#symbols and compare its output for the bn locale against the CLDR numberSystem distinction described in the issue. The work is complete when beng and latn symbols remain separate in the exported YAML instead of being merged.