Initialisation queries, dynamic sets and other minor improvements

What's Changed

• Static analysis: improve typing throughout by @g105b in #241
• test: hard dependencies by @g105b in #309
• Bump phpstan/phpstan from 1.8.0 to 1.8.1 by @dependabot in #310
• maintenance: dependabot by @g105b in #319
• Update ci by @g105b in #342
• CI improvement by @g105b in #349
• ci: consistent workflow for all tests by @g105b in #351
• feature: allow passing initialisation queries in settings by @g105b in #354
• Dynamic sets by @g105b in #356
• Datetime from timestamp by @g105b in #361
• Split queries by semicolon by @g105b in #362

New Contributors

• @dependabot made their first contribution in #310

Full Changelog: v1.4.0...v1.4.1