Lazy load of relation metadata in get relation #2993

Job	Run time
unit test / python 3.9	1m 27s
build packages	18s
code-quality	1m 53s
unit test / python 3.10	1m 29s
unit test / python 3.11	1m 23s
unit test / python 3.12	1m 41s
verify packages / python 3.9 / ubuntu-latest / whl	19s
verify packages / python 3.9 / ubuntu-latest / gz	17s
verify packages / python 3.10 / ubuntu-latest / whl	18s
verify packages / python 3.10 / ubuntu-latest / gz	19s
verify packages / python 3.11 / ubuntu-latest / whl	18s
verify packages / python 3.11 / ubuntu-latest / gz	19s
verify packages / python 3.12 / ubuntu-latest / whl	20s
verify packages / python 3.12 / ubuntu-latest / gz	26s
verify packages / python 3.9 / macos-14 / whl	39s
verify packages / python 3.9 / macos-14 / gz	33s
verify packages / python 3.10 / macos-14 / whl	43s
verify packages / python 3.10 / macos-14 / gz	32s
verify packages / python 3.11 / macos-14 / whl	17s
verify packages / python 3.11 / macos-14 / gz	17s
verify packages / python 3.12 / macos-14 / whl	20s
verify packages / python 3.12 / macos-14 / gz	28s
verify packages / python 3.9 / windows-latest / whl	1m 35s
verify packages / python 3.9 / windows-latest / gz	1m 37s
verify packages / python 3.10 / windows-latest / whl	1m 25s
verify packages / python 3.10 / windows-latest / gz	1m 28s
verify packages / python 3.11 / windows-latest / whl	1m 37s
verify packages / python 3.11 / windows-latest / gz	1m 30s
verify packages / python 3.12 / windows-latest / whl	1m 25s
verify packages / python 3.12 / windows-latest / gz	1m 42s
	26m 55s

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