[WIP] 9.0 module prototyper workflow DO NOT MERGE

[lmignon]

depends of #318

This one is a WIP to implement the export of workflow definitions as xml data. The API is deigned in a way that this PR add the bases to export any model instance as xml data. see def get_import_compat_values(self, model_instances) https://github.com/OCA/server-tools/compare/9.0...acsone:9.0-module-prototyper-workflow-lmi?expand=1#diff-cdf281c7a0a0df8368bb20967d097304R538 and the jinja macro render_model_record(instance, fields_value, mode=None) https://github.com/OCA/server-tools/compare/9.0...acsone:9.0-module-prototyper-workflow-lmi?expand=1#diff-a00f5735167d63ac91dceb946d0980a2R1

TODO:

• functional test
• unit test
• better template formatting

Your advice are welcome...

[coveralls]

Coverage decreased (-5.4%) to 62.634% when pulling 5c1d7d4 on acsone:9.0-module-prototyper-workflow-lmi into 632ce98 on OCA:9.0.

[coveralls]

Coverage decreased (-5.4%) to 62.634% when pulling 38340c8 on acsone:9.0-module-prototyper-workflow-lmi into 632ce98 on OCA:9.0.

[coveralls]

Coverage decreased (-5.4%) to 62.634% when pulling a39529e on acsone:9.0-module-prototyper-workflow-lmi into 632ce98 on OCA:9.0.

[coveralls]

Coverage decreased (-6.7%) to 61.367% when pulling 9ffa4b2 on acsone:9.0-module-prototyper-workflow-lmi into 632ce98 on OCA:9.0.

[coveralls]

Coverage decreased (-6.7%) to 61.367% when pulling 5c1bfce on acsone:9.0-module-prototyper-workflow-lmi into 632ce98 on OCA:9.0.

[coveralls]

Coverage decreased (-7.7%) to 60.369% when pulling 5cc09a9 on acsone:9.0-module-prototyper-workflow-lmi into 632ce98 on OCA:9.0.

[github-actions]

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