Update kedro pipeline create to use new /conf file structure

[amandakys]

Description

Currently, the kedro pipeline create command creates a new /parameters folder and adds a {pipeline-name}.yml inside (or just adds the file to the parameters folder if it aready exists.

Context

To make this more consistent and so the global parameters.yml doesn't just randomly sit outside the directories, we want to maintian all the pipeline specific config files directly in the /conf with a specific naming convention.

Before

├── conf
    └── base
        └── parameters         
	    ├── data_science.yml     #blank files
        ├── catalog.yml              #blank files   
	└── parameters.yml           #blank files

After

├── conf
    └── base
	├── catalog_data_science.yml          #blank files
	└── parameters_data_science.yml       #blank files
        ├── catalog.yml          #blank files   
	└── parameters.yml       #blank files

(This is outdated - edited by Nok)

Possible Implementation

calling the updated kedro pipeline create should:

1. add parameters_{pipeline_name}.yml to /conf
2. add catalog_{pipeline_name}.yml to /conf
3. add a pipeline diretory called {pipeline_name} to the /pipelines with empty nodes.py and pipeline.py files

Currently, it also adds a /tests directory, but we want to remove this from the command because of work on #2149

Final decision - see comments for the full details

Following discussion with @merelcht @deepyaman @astrojuanlu @DimedS we decided to move forward with this work with the following updates:

calling kedro pipeline create will:

• add parameters_{pipeline_name}.yml to /conf
• add a pipeline directory called {pipeline_name} to the /pipelines with empty nodes.py and pipeline.py files
• No catalog_pipeline_name.yml
  it will no longer add a /tests directory it will also no longer add a catalog_{pipeline_name}.yml to /conf, this will instead be delegated to the kedro catalog create command which will also need updating as a follow up to this. Update kedro catalog create to use new /conf structure  #2844

• Update kedro pipeline create to use new /conf file structure  #2752
• Update starters to use new /conf structure  #2753
• Update kedro catalog create to use new /conf structure  #2844

[amandakys]

Following discussion with @merelcht @deepyaman @astrojuanlu @DimedS we decided to move forward with this work with the following updates:

calling kedro pipeline create will:

• add parameters_{pipeline_name}.yml to /conf
• add a pipeline directory called {pipeline_name} to the /pipelines with empty nodes.py and pipeline.py files

it will no longer add a /tests directory
it will also no longer add a catalog_{pipeline_name}.yml to /conf, this will instead be delegated to the kedro catalog create command which will also need updating as a follow up to this. #2844

[merelcht]

Following discussion with @merelcht @deepyaman @astrojuanlu @DmitriiDeriabinQB we decided to move forward with this work with the following updates:

I think you meant to tag @DimedS 😄

[noklam]

I update the description to reflect the final decision - I also make it a parent ticket so it's easy to track the rest. This is done already but I think it will be useful to keep the record for future reference.