Lazy load of relation metadata in get relation #2996

Job	Run time
build packages	13s
unit test / python 3.9	2m 3s
code-quality	2m 18s
unit test / python 3.10	1m 27s
unit test / python 3.11	1m 27s
unit test / python 3.12	1m 35s
verify packages / python 3.9 / ubuntu-latest / whl	18s
verify packages / python 3.9 / ubuntu-latest / gz	18s
verify packages / python 3.10 / ubuntu-latest / whl	16s
verify packages / python 3.10 / ubuntu-latest / gz	19s
verify packages / python 3.11 / ubuntu-latest / whl	24s
verify packages / python 3.11 / ubuntu-latest / gz	16s
verify packages / python 3.12 / ubuntu-latest / whl	26s
verify packages / python 3.12 / ubuntu-latest / gz	30s
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	33s
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	23s
verify packages / python 3.12 / macos-14 / gz	20s
verify packages / python 3.9 / windows-latest / whl	1m 53s
verify packages / python 3.9 / windows-latest / gz	1m 15s
verify packages / python 3.10 / windows-latest / whl	1m 44s
verify packages / python 3.10 / windows-latest / gz	1m 4s
verify packages / python 3.11 / windows-latest / whl	51s
verify packages / python 3.11 / windows-latest / gz	50s
verify packages / python 3.12 / windows-latest / whl	1m 30s
verify packages / python 3.12 / windows-latest / gz	1m 29s
	26m 3s

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