WIP - HTM-1654: Use JSON marshalling for session serialisation

[mprins]

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
54	1	53	0

View the top 1 failed test(s) by shortest run time

org.tailormap.api.configuration.JdbcSessionConfigurationTest::should_serialize_and_deserialize_security_context_with_oidc_userdetails_round_trip

Stack Traces | 0.063s run time

Failed to convert from type [byte[]] to type [java.lang.Object] for value [{...}]

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Test Results

0 tests   0 ✅  0s ⏱️
0 suites  0 💤
0 files    0 ❌

Results for commit eb91ead.

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