Db v4 move graph folder

[arienandalibi]

What changes were proposed in this pull request?

Move graph_folder.rs constants (directory and file names regarding exported graphs) out of the raphtory crate and into raphtory-api.

Why are the changes needed?

Following previous changes, we needed access to GRAPH_META_PATH in pometry-storage, where we can't import from raphtory.

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

No

How was this patch tested?

Tests still pass

Are there any further changes required?

No

[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: adede86	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/graph_latest	3 ns/iter (± 0)	0 ns/iter (± 0)	+∞
lotr_graph_materialise/materialize	8051392 ns/iter (± 53457)	1564816 ns/iter (± 35303)	5.15
lotr_graph_window_100/num_nodes	13 ns/iter (± 0)	5 ns/iter (± 0)	2.60
lotr_graph_window_100_materialise/materialize	8139728 ns/iter (± 83432)	1669150 ns/iter (± 10700)	4.88
lotr_graph_window_10/has_node_existing	137 ns/iter (± 10)	62 ns/iter (± 11)	2.21
lotr_graph_window_10/iterate nodes	28561 ns/iter (± 335)	11339 ns/iter (± 40)	2.52
lotr_graph_window_10_materialise/materialize	3311386 ns/iter (± 28932)	971980 ns/iter (± 4278)	3.41
lotr_graph_subgraph_10pc/has_node_nonexisting	5 ns/iter (± 0)	2 ns/iter (± 0)	2.50
lotr_graph_subgraph_10pc_materialise/materialize	2071907 ns/iter (± 21757)	334634 ns/iter (± 1287)	6.19
lotr_graph_subgraph_10pc_windowed/has_node_existing	141 ns/iter (± 8)	62 ns/iter (± 14)	2.27
lotr_graph_subgraph_10pc_windowed/iterate nodes	4865 ns/iter (± 102)	1365 ns/iter (± 3)	3.56
lotr_graph_subgraph_10pc_windowed_materialise/materialize	1246015 ns/iter (± 12404)	230399 ns/iter (± 2617)	5.41
lotr_graph_window_50_layered/num_edges_temporal	147011 ns/iter (± 3487)	70121 ns/iter (± 7586)	2.10
lotr_graph_window_50_layered/has_node_existing	401 ns/iter (± 28)	129 ns/iter (± 12)	3.11
lotr_graph_window_50_layered/iterate nodes	66622 ns/iter (± 2391)	19308 ns/iter (± 47)	3.45
lotr_graph_window_50_layered/iterate edges	171448 ns/iter (± 1699)	83616 ns/iter (± 1318)	2.05
lotr_graph_window_50_layered/graph_latest	85838 ns/iter (± 2089)	36649 ns/iter (± 916)	2.34
lotr_graph_window_50_layered_materialise/materialize	29233032 ns/iter (± 151361)	3488825 ns/iter (± 24948)	8.38
lotr_graph_persistent_window_50_layered/num_edges_temporal	599618 ns/iter (± 5305)	192686 ns/iter (± 1569)	3.11
lotr_graph_persistent_window_50_layered/has_node_existing	416 ns/iter (± 370)	174 ns/iter (± 83)	2.39
lotr_graph_persistent_window_50_layered/iterate nodes	96990 ns/iter (± 838)	35886 ns/iter (± 191)	2.70
lotr_graph_persistent_window_50_layered/graph_latest	128257 ns/iter (± 1443)	57549 ns/iter (± 4809)	2.23
lotr_graph_persistent_window_50_layered_materialise/materialize	49765367 ns/iter (± 183761)	5298035 ns/iter (± 147912)	9.39

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

[ljeub-pometry]

We can just move this entire file to raphtory-api, then you can just call the method in here to update the metadata.