Add LLP compression to the WebGraph pipeline

...org/softwareheritage/graph/utils/ComposePermutations.java

swh/graph/cli.py

swh/graph/config.py

swh/graph/tests/dataset/output/example-transposed.graph

swh/graph/tests/dataset/output/example-transposed.obl

swh/graph/tests/dataset/output/example-transposed.offsets

swh/graph/tests/dataset/output/example-transposed.properties

swh/graph/tests/dataset/output/example.graph

swh/graph/tests/dataset/output/example.mph

swh/graph/tests/dataset/output/example.node2swhid.bin

swh/graph/tests/dataset/output/example.node2type.map

swh/graph/tests/dataset/output/example.obl

swh/graph/tests/dataset/output/example.offsets

swh/graph/tests/dataset/output/example.order

swh/graph/tests/dataset/output/example.properties

swh/graph/tests/dataset/output/example.stats

swh/graph/webgraph.py