Draft: Get accounts api method

request from @asgarth

for a few things on peakd I have to call condenser_api.get_accounts and database_api.find_accounts with a list of accounts. 90% of the times I don't need all the details provided in the response and I would be totally ok with the same details provided by bridge.get_profile. Can we create a bridge.get_profiles that I can use with an array of accounts as parameter? I assume others will find it useful too