ENH: Using float converters on integer values

Summary

see https://gitlab.com/caosdb/caosdb-crawler/-/issues/10

Note, that I also introduced the registered integration tests.

Test Environment

unit und int tests

Check List for the Author

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• All automated tests pass
• Reference related issues
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  • Problems with old code
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Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
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.docker/docker-compose.yml

@@ -34,6 +34,7 @@ services:
       DEBUG: 1
       CAOSDB_CONFIG_AUTHTOKEN_CONFIG: "conf/core/authtoken.example.yaml"
       CAOSDB_CONFIG_TRANSACTION_BENCHMARK_ENABLED: "TRUE"
+      CAOSDB_CONFIG__CAOSDB_INTEGRATION_TEST_SUITE_KEY: 10b128cf8a1372f30aa3697466bb55e76974e0c16a599bb44ace88f19c8f61e2
 volumes:
   scripting:
   authtoken: