Add packer and terraform for running a dev server in Hetzner

[alexklibisz]

Related Issue

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Changes

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Testing and Validation

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[alexklibisz]

Results on cx41 were:

Model	Parameters	Recall	Queries per Second
eknn-l2lsh	L=100 k=4 w=1024 candidates=500 probes=0	0.379	133.326
eknn-l2lsh	L=100 k=4 w=1024 candidates=1000 probes=0	0.446	118.878
eknn-l2lsh	L=100 k=4 w=1024 candidates=500 probes=3	0.635	101.896
eknn-l2lsh	L=100 k=4 w=1024 candidates=1000 probes=3	0.717	94.297
eknn-l2lsh	L=100 k=4 w=2048 candidates=500 probes=0	0.767	115.363
eknn-l2lsh	L=100 k=4 w=2048 candidates=1000 probes=0	0.846	104.785
eknn-l2lsh	L=100 k=4 w=2048 candidates=500 probes=3	0.921	79.075
eknn-l2lsh	L=100 k=4 w=2048 candidates=1000 probes=3	0.960	73.672

[alexklibisz]

Performance in Hetzner was terrible compared to AWS. I'll open a PR shortly that adds a terraform file for spinning up a development and benchmarking instance in AWS.