[FIX] openerp: monetary not xmlrpc serializable

Since 1ba91042d monetary fields values could be represented by a
float_precision which is aimed as an improvment for digit precision when
saving a monetary field value to the database.

xmlrpclib (we are using to serialze the response) is handling some
common datatypes, but for custom one we would need to register it with
how it needs to be serialized.

This commit add a convert_to_read method to the Monetary field so when
reading monetary fields value we get the float numbers and not the
float_precision ones.

The float_precision is needed when saving, so it is alright to have float
when reading.

fixes #13857
closes #14125

opw-692373

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