Remove foreign keys on entity id

[apeksharma]

Detailed description:

• Replace foreign keys columns - cud entity, payer account, node account - with encoded entity ids
• Use encoded ids in REST to remove joins with t_entities table
• Migration testing: Migrating db with ~2.93m transactions took ~20sec. Extrapolating, mainnet with ~150m txns should take less than 30min
  • Migration is done by creating new transactions table. Index idx_t_transactions_node_account is not created for the new table (Explore usefulness of indexes idx_t_transactions_node_account and idx_t_transactions_payer_id #548)
• Change DataGenerator to use EntityId rather than just a long for entity num
• Remove dead functions from EntityRepository
• Now auto renew accounts and proxy accounts are inserted in batch (with other PreparedStatements) rather than synchronously during transaction processing
• There is one remaining entity lookup, will fix that later. It won't affect performance of crypto transfer heavy workloads

Perf testing:
Importer:
- Setup
Db preloaded with 2.93 million transactions
Workload: ~700k txns (20k tps, 7 files)
- Stats
Migration time: 20s
TPS:

2020-06-09 05:02:54,076 INFO  [scheduling-4] c.h.m.i.p.r.RecordFileParser Finished parsing 100034 transactions from record file ./data/recordstreams/valid/2020-02-09T20_00_00.004108Z.rcd in 16888ms (5923/s)
2020-06-09 05:03:06,175 INFO  [scheduling-4] c.h.m.i.p.r.RecordFileParser Finished parsing 99995 transactions from record file ./data/recordstreams/valid/2020-02-09T20_01_40.009724Z.rcd in 12061ms (8290/s)
2020-06-09 05:03:18,396 INFO  [scheduling-4] c.h.m.i.p.r.RecordFileParser Finished parsing 99997 transactions from record file ./data/recordstreams/valid/2020-02-09T20_03_20.004973Z.rcd in 12209ms (8190/s)
2020-06-09 05:03:30,431 INFO  [scheduling-4] c.h.m.i.p.r.RecordFileParser Finished parsing 100028 transactions from record file ./data/recordstreams/valid/2020-02-09T20_05_00.011814Z.rcd in 12023ms (8319/s)
2020-06-09 05:03:42,546 INFO  [scheduling-4] c.h.m.i.p.r.RecordFileParser Finished parsing 100004 transactions from record file ./data/recordstreams/valid/2020-02-09T20_06_40.019463Z.rcd in 12104ms (8262/s)
2020-06-09 05:04:00,857 INFO  [scheduling-4] c.h.m.i.p.r.RecordFileParser Finished parsing 99998 transactions from record file ./data/recordstreams/valid/2020-02-09T20_08_20.006814Z.rcd in 18300ms (5464/s)
2020-06-09 05:04:24,795 INFO  [scheduling-4] c.h.m.i.p.r.RecordFileParser Finished parsing 100008 transactions from record file ./data/recordstreams/valid/2020-02-09T20_10_00.001180Z.rcd in 23927ms (4179/s)

Which issue(s) this PR fixes:
Fixes #570
Partly addresses #548

Special notes for your reviewer:

Checklist

• Documentation added
• Tests updated

[steven-sheehy]

Overall looks good. There's a couple that need to be fixed and the rest can be addressed in a follow up.

[steven-sheehy]

We should later convert this id to EntityId

[Nana-EC]

Huge change. Nice job.
Left some comments but you can address them if you so chose in a future smaller PR :)

[apeksharma]

Thanks for the review guys, will post quick followup PR.