Lazy load of relation metadata in get relation #2994

Job	Run time
unit test / python 3.9	1m 51s
code-quality	1m 51s
unit test / python 3.10	1m 27s
build packages	14s
unit test / python 3.11	1m 30s
unit test / python 3.12	1m 38s
verify packages / python 3.9 / ubuntu-latest / whl	21s
verify packages / python 3.9 / ubuntu-latest / gz	19s
verify packages / python 3.10 / ubuntu-latest / whl	17s
verify packages / python 3.10 / ubuntu-latest / gz	19s
verify packages / python 3.11 / ubuntu-latest / whl	17s
verify packages / python 3.11 / ubuntu-latest / gz	20s
verify packages / python 3.12 / ubuntu-latest / whl	25s
verify packages / python 3.12 / ubuntu-latest / gz	32s
verify packages / python 3.9 / macos-14 / whl	35s
verify packages / python 3.9 / macos-14 / gz	37s
verify packages / python 3.10 / macos-14 / whl	31s
verify packages / python 3.10 / macos-14 / gz	33s
verify packages / python 3.11 / macos-14 / whl	16s
verify packages / python 3.11 / macos-14 / gz	20s
verify packages / python 3.12 / macos-14 / whl	21s
verify packages / python 3.12 / macos-14 / gz	22s
verify packages / python 3.9 / windows-latest / whl	53s
verify packages / python 3.9 / windows-latest / gz	1m 38s
verify packages / python 3.10 / windows-latest / whl	1m 12s
verify packages / python 3.10 / windows-latest / gz	1m 51s
verify packages / python 3.11 / windows-latest / whl	1m 13s
verify packages / python 3.11 / windows-latest / gz	1m 28s
verify packages / python 3.12 / windows-latest / whl	1m 32s
verify packages / python 3.12 / windows-latest / gz	1m 59s
	26m 42s

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