Add SRU opener / `open-sru`

[TobiasNx]

Like OAI PMH opener, metafacture should be able to retrieve all records of a SRU request. SRU is an important library standard like OAI PMH: See https://www.loc.gov/standards/sru/index.html

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Besides being an important library standard.

We have two use-cases:

• In context of RPB we need to fetch data from HeBis via SRU: RPB-225
• Fetch ZDB Holding Data from SRU of DNB for DE-Sol1: Set up draft test workflow for ZDB holdings of DE-Sol1 #3 hbz/lobid-extra-holdings#8

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A new modul should be configurable with the specific SRU keywords.

The opener should be similarl to gist.github.com/jorol/989ea5dd464fb85bd99b4733710d2890#oai-pmh and https://github.com/LibreCat/Catmandu-SRU/tree/dev

In Flux something like:

| open-sru(base="https://services.dnb.de/sru/zdb", recordSchema="MARC21-xml", query="tit = soil biology") [We do not need the extra parser since we are parsing it in the next step of a flux workflow]

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Possible other Java sources/repositories that could help develop an SRU opener for Metafacture:
https://github.com/HSG-Library/alma-sru-client
https://github.com/opacapp/opacclient/blob/master/opacclient/libopac/src/main/java/de/geeksfactory/opacclient/apis/SRU.java
https://github.com/indexdata/yaz4j
https://github.com/rism-international/sru-downloader
https://github.com/indexdata/cql-java
https://www.loc.gov/standards/sru/resources/products.html
https://github.com/kitodo/kitodo-production/blob/main/Kitodo/src/main/java/org/kitodo/production/services/data/ImportService.java

Inspiration from a commandline tool for sru https://github.com/ubleipzig/srufetch

[TobiasNx]

This could maybe help: https://github.com/opacapp/opacclient/blob/master/opacclient/libopac/src/main/java/de/geeksfactory/opacclient/apis/SRU.java

[TobiasNx]

Also https://www.loc.gov/standards/sru/resources/products.html

The SRU module would be nice to introduce it to MF before the workshop in January since it is part of their corriculum

[TobiasNx]

And this: https://github.com/indexdata/cql-java

[TobiasNx]

Opener should be similarl to https://gist.github.com/jorol/989ea5dd464fb85bd99b4733710d2890#oai-pmh and https://
github.com/LibreCat/Catmandu-SRU/tree/dev

in metafacture:

| open-sru(base="https://services.dnb.de/sru/zdb", recordSchema="MARC21-xml", query="tit = soil biology", parser="marcxml")

[TobiasNx]

This feature is also required for https://jira.hbz-nrw.de/browse/RPB-225

[TobiasNx]

I also found this: https://github.com/rism-international/sru-downloader

[TobiasNx]

I cleaned up to comments to make this issue more compact.

[TobiasNx]

Now I have the first usecase:

I want to fetch all records from this SRU for records with query dnb.isil=DE-SOl1:

https://services.dnb.de/sru/zdb?version=1.1&operation=searchRetrieve&query=dnb.isil%3DDE-Sol1&recordSchema=MARC21plus-xml

I need this here to create a productive workflow that collects all records: hbz/lobid-extra-holdings#8