[Project] Schema extensions

[ewels]

Meta-task to track collection of issues which are all related to extending the spec for the Nextflow schema - primarily parameters, but should be taken into consideration for sample sheet schema as well, as we build out that stack.

Tasks

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1. Schema: Create meta-schema for Nextflow schema #2436
   schema +1
2. Lint pipeline schema with meta-schema #2654
   linting +1
3. Schema: Write future reference schema #2748
   schema +1
4. Schema: Support nested parameters. #1554
   schema +1
5. Schema: Support anyOf and allOf #2427
   schema +1
6. Schema: Support conditional subschemas #2428
   schema +1
7. Schema: Conditional input file validation #2453
   schema +1
8. Schema: Support additional format types #2457
   schema +1
9. Rewrite schema build page #2463
   schema +1
10. Rewrite pipeline launch page website#2015
    enhancement +1
11. Depreciate & remove mimetype #2527
    schema +1
12. nextflow_schema.json linting fails with oneOf in required #2619
    bug +1
13. Update schema builder to use JSON draft 2020-12 #2784
    schema +1

These issues typically affect all of the following:

• nf-core schema build
• nf-core schema lint
• The web schema build UI (needs rewriting, see Rewrite schema build page #2463)
• nf-core launch (needs rewriting, see Rewrite terminal version of nf-core launch #2464)
• The nf-core web launch UI & validation code (needs rewriting, see Rewrite pipeline launch page website#2015)
• Pipeline template validation code (nextflow run ... with the nf-validation plugin)
• Pipeline template help text (nextflow run ... --help with the nf-validation plugin)