fix week alignment (should align to Monday, not Thursday)

[ljeub-pometry]

What changes were proposed in this pull request?

AlignmentUnit::Week now uses Monday as the start of the week

Why are the changes needed?

1970-1-1 is a Thursday...

Does this PR introduce any user-facing change? If yes is this documented?

Fixes an alignment bug

How was this patch tested?

Added a prop test to verify the alignment

[fabianmurariu]

LGTM

[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark 'Rust Benchmark'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 2.

Benchmark suite	Current: 25921eb	Previous: 9823ef7	Ratio
lotr_graph/num_edges	4 ns/iter (± 0)	0 ns/iter (± 0)	+∞
lotr_graph/num_nodes	4 ns/iter (± 0)	1 ns/iter (± 0)	4
lotr_graph/has_node_nonexisting	5 ns/iter (± 0)	2 ns/iter (± 0)	2.50
lotr_graph/iterate_exploded_edges	605411 ns/iter (± 9440)	285473 ns/iter (± 2920)	2.12
lotr_graph/graph_latest	3 ns/iter (± 0)	0 ns/iter (± 0)	+∞
lotr_graph_materialise/materialize	8639428 ns/iter (± 64032)	1564816 ns/iter (± 35303)	5.52
lotr_graph_window_100/num_nodes	14 ns/iter (± 0)	5 ns/iter (± 0)	2.80
lotr_graph_window_100/iterate_exploded_edges	653454 ns/iter (± 5495)	325242 ns/iter (± 847)	2.01
lotr_graph_window_100_materialise/materialize	8889930 ns/iter (± 52704)	1669150 ns/iter (± 10700)	5.33
lotr_graph_window_10/has_node_existing	143 ns/iter (± 11)	62 ns/iter (± 11)	2.31
lotr_graph_window_10/iterate nodes	29471 ns/iter (± 235)	11339 ns/iter (± 40)	2.60
lotr_graph_window_10/iterate_exploded_edges	339589 ns/iter (± 4661)	155788 ns/iter (± 1001)	2.18
lotr_graph_window_10_materialise/materialize	3714813 ns/iter (± 11354)	971980 ns/iter (± 4278)	3.82
lotr_graph_subgraph_10pc/has_node_nonexisting	5 ns/iter (± 0)	2 ns/iter (± 0)	2.50
lotr_graph_subgraph_10pc_materialise/materialize	2062547 ns/iter (± 12121)	334634 ns/iter (± 1287)	6.16
lotr_graph_subgraph_10pc_windowed/has_node_existing	150 ns/iter (± 10)	62 ns/iter (± 14)	2.42
lotr_graph_subgraph_10pc_windowed/iterate nodes	4965 ns/iter (± 84)	1365 ns/iter (± 3)	3.64
lotr_graph_subgraph_10pc_windowed_materialise/materialize	1245586 ns/iter (± 10521)	230399 ns/iter (± 2617)	5.41
lotr_graph_window_50_layered/num_edges_temporal	154360 ns/iter (± 4622)	70121 ns/iter (± 7586)	2.20
lotr_graph_window_50_layered/has_node_existing	386 ns/iter (± 23)	129 ns/iter (± 12)	2.99
lotr_graph_window_50_layered/has_node_nonexisting	5 ns/iter (± 0)	2 ns/iter (± 0)	2.50
lotr_graph_window_50_layered/iterate nodes	67789 ns/iter (± 508)	19308 ns/iter (± 47)	3.51
lotr_graph_window_50_layered/iterate edges	189797 ns/iter (± 3029)	83616 ns/iter (± 1318)	2.27
lotr_graph_window_50_layered/graph_latest	76987 ns/iter (± 1168)	36649 ns/iter (± 916)	2.10
lotr_graph_window_50_layered_materialise/materialize	33157127 ns/iter (± 120788)	3488825 ns/iter (± 24948)	9.50
lotr_graph_persistent_window_50_layered/num_edges_temporal	649471 ns/iter (± 5695)	192686 ns/iter (± 1569)	3.37
lotr_graph_persistent_window_50_layered/has_node_existing	427 ns/iter (± 296)	174 ns/iter (± 83)	2.45
lotr_graph_persistent_window_50_layered/has_node_nonexisting	5 ns/iter (± 0)	2 ns/iter (± 0)	2.50
lotr_graph_persistent_window_50_layered/iterate nodes	92169 ns/iter (± 492)	35886 ns/iter (± 191)	2.57
lotr_graph_persistent_window_50_layered/iterate edges	183605 ns/iter (± 5194)	84161 ns/iter (± 596)	2.18
lotr_graph_persistent_window_50_layered/iterate_exploded_edges	4640720 ns/iter (± 141461)	1659940 ns/iter (± 19402)	2.80
lotr_graph_persistent_window_50_layered_materialise/materialize	62671542 ns/iter (± 450688)	5298035 ns/iter (± 147912)	11.83

This comment was automatically generated by workflow using github-action-benchmark.