Perovskite Solar Cell database schema with ELN functionality

This draft contains a metainfo schema of the Perovskite Database with ELN annotations. The schema contains several normalizers that populate quantities in Results. It also contains extra tools like:

1. formula_converte.py which converts formulas with soma abbreviations like MA to the chemical representation of the cations: CH3NH3.
2. eqe_importer.py which reads exemplary eqe files and does some parsing, and derivation of extra quantities.
3. jv_reader.py is a very specific reader of J-V data of a lab for demonstration purposes which is used to populate quantities in the schema.
4. entry_writer.py is a tool that was used to convert the entries in the .csv of the original database to archive.json type entries.

Additionally, an Optoelectronic subsection has been created in Results that also contains a more specific SolarCell generalized subsection. The goal of this subsection is to accommodate any solar cell data in the future regardless of the technology.

To discuss:
At the moment, I have doubts about whether or not we should display the PerovskiteSolarCell schema in ELN mode or not. The reason for it is that as we replicated the original schema of the database, some quantities are not ideal, e.g. many numeric quantities being str type because the database for this field contained numbers separated by '|' and so on. An alternative would be to disable the ELN annotations in this schema and create solar cell base classes with ELN annotations that could be re-used in future versatile solar cell-based schemas.

gui/src/components/entry/properties/OptoelectronicPropertiesCard.js

+/*
+ * Copyright The NOMAD Authors.
+ *
+ * This file is part of NOMAD. See https://nomad-lab.eu for further info.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import React from 'react'
+import PropTypes from 'prop-types'
+import { PropertyCard } from './PropertyCard'
+import OptoelectronicProperties from '../../visualization/OptoelectronicProperties'
+
+const OptoelectronicPropertiesCard = React.memo(({index, properties, archive}) => {
+  // Find out which properties are present
+  const hasBg = properties.has('optoelectronic.band_gap')
+  const hasSc = properties.has('solar_cell')
+
+  // Do not show the card if none of the properties are available
+  if (!hasBg && !hasSc) {
+    return null
+  }
+
+  // Resolve band gap data
+  const bandGap = index?.results?.properties?.optoelectronic?.band_gap || false
+
+  // Resolve solar cell data
+  const solarCell = index?.results?.properties?.optoelectronic?.solar_cell || false
+
+  return <PropertyCard title="Optoelectronic properties">
+    <OptoelectronicProperties bandGap={bandGap} solarCell={solarCell}/>
+  </PropertyCard>
+})
+
+OptoelectronicPropertiesCard.propTypes = {
+  index: PropTypes.object.isRequired,
+  properties: PropTypes.object.isRequired,
+  archive: PropTypes.object
+}
+
+export default OptoelectronicPropertiesCard