add new uri mappings for techniques

from @patrick-lloyd-ray

```
http://purl.obolibrary.org/obo/OBI_0002188 = multi electrode extracellular electrophysiology recording technique
http://uri.interlex.org/base/ilx_0739628 = spike sorting technique
http://uri.interlex.org/base/ilx_0739623 = signal filtering technique
http://uri.interlex.org/base/ilx_0381676 = surgical technique
http://purl.obolibrary.org/obo/OBI_0002177 = patch clamp technique
http://purl.obolibrary.org/obo/OBI_0002185 = current clamp technique
http://purl.obolibrary.org/obo/OBI_0002182 = voltage clamp technique
http://uri.interlex.org/base/ilx_0739658 = two-photon microscopy technique
http://uri.interlex.org/base/ilx_0381676 = surgical technique
http://uri.interlex.org/base/ilx_0739591 = behavioral technique
http://uri.interlex.org/base/ilx_0739745 = analytical technique
http://uri.interlex.org/base/ilx_0739484 = Fourier analysis technique
http://uri.interlex.org/base/ilx_0739640 = photographic technique
```

to be added to this section: https://github.com/dandi/dandi-cli/blob/master/dandi/metadata.py#L681

but perhaps is an opportunity to consider moving these to the schema in some form or to a json data file in the repo instead of a dict.