Turn on strict tables for SQLITE3 when running integration tests

[niftynei]

It'd be great to turn on strict tables etc for our integration test suite.

Suggested-By: @answrguy

https://www.sqlite.org/stricttables.html

[BitcoinJiuJitsu]

Open CLN bounty on this:
https://community.corelightning.org/c/cln-bounties/5390-turn-on-strict-tables-for-sqlite3-when-running-integration-tests

[s373nZ]

Would it be reasonable to assume that lightningd is running the integration tests if network is on regtest and the --developer option is set?