WIP: Use timescaledb recommended way to backup/restore schema

[ashwinphatak]

Part of #68

• Create distributed hypertables directly from original tables.
• Use timescaledb recommended way to backup/restore schema

[ashwinphatak]

go-ethereum-ipld-eth-db-1  | 2022-05-04 12:39:22.012 UTC [204] ERROR:  invalid INSERT on the root table of hypertable "header_cids"
go-ethereum-ipld-eth-db-1  | 2022-05-04 12:39:22.012 UTC [204] HINT:  Make sure the TimescaleDB extension has been preloaded.

Likely the same as the ts_insert_blocker trigger error we were getting in schema.sql. Surprising, as we're using the approach in https://docs.timescale.com/timescaledb/latest/how-to-guides/backup-and-restore/pg-dump-and-restore/#backup-hypertable. Also see https://stackoverflow.com/a/61955914

[ashwinphatak]

Related timescale/timescaledb#1581 and timescale/timescaledb-parallel-copy#38

[ashwinphatak]

Superseded by #75