attr: use hashmap for attribute dictionary

attr: use hashmap for attribute dictionary

The current implementation of the attribute dictionary uses a custom
hashtable.  This modernizes the dictionary by converting it to the builtin
'hashmap' structure.

Also, in order to enable a threaded API in the future add an
accompanying mutex which must be acquired prior to accessing the
dictionary of interned attributes.

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>