add logins store api method add_with_record

[jo]

• add logins store api methods for bulk insert and meta insert, intended to be used during migration and CSV import on desktop:
  • fn add_with_record(&self, entry_with_record: LoginEntryWithRecordFields): add a login together with metadata
  • fn add_many(&self, entries: Vec<LoginEntry>): add multiple logins with single transaction
  • fn add_many_with_records(&self, entries_with_records: Vec<LoginEntryWithRecordFields>): add multiple logins with metadata within single transaction

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[bendk]

This looks great to me. The only thing I'm really concerned about is finding a better name for RecordFields. At the very least it should be LoginRecordFields, otherwise there's a high chance for confusion or name conflicts on Swift.

[bendk]

The new names and docstrings look great to me. I think this is ready to merge.