Incorporate ACDD and IOOS standards

[jmcvey3]

Update template so that users can choose a specific standards type, which is then automatically set up in the generated ingest pipeline. Also updates basic tsdat template to set CF time attributes.

Left to do:

• Fix relative import for windows so "make cookies" will work
• Set default standards to "basic"

[maxwelllevin]

Changes requested for how we approach the schema generation (noted in review comments). The main thing is just that I think we should generate the IOOS/ACDD/basic schema once and from then on we should just default to using that schema, instead of doing this for each new ingest we generate.

I can tell a lot of work went in to the updated template, especially in the wording / description of all the attributes. I think this is a massive improvement over what we currently have, so I'm looking forward to merging these changes in.

[maxwelllevin]

Changes requested for how we approach the schema generation (noted in review comments). The main thing is just that I think we should generate the IOOS/ACDD/basic schema once and from then on we should just default to using that schema, instead of doing this for each new ingest we generate.

I changed my mind on the details for this. I think we should add these schemas to the core tsdat library and allow users to select which one they'd like to use when the tsdat generate_schema CLI is invoked. I'll add those changes to tsdat/tsdat#139

[maxwelllevin]

@jmcvey3 merge at-will