[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.

Schema changes

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1. Schema: Create meta-schema for Nextflow schema #2436
   schema +1
2. Update schema builder to use JSON draft 2020-12 #2784
   schema +1
3. Schema: Support nested parameters. #1554
   schema +1
4. Schema: Support anyOf, allOf and oneOf #2427
   schema +1
5. Schema: Support conditional subschemas #2428
   schema +1
6. Schema: Conditional input file validation #2453
   schema +1
7. Schema: Support multi-line text inputs #3145
   schema +1
8. Depreciate & remove mimetype #2527
   schema +1
9. Schema: Support additional format types #2457
   schema +1
10. Lint pipeline schema with meta-schema #2654
    linting +1
11. Schema: Write future reference schema #2748
    schema +1
12. Rewrite schema build page #2463
    schema +1
    
13. Rewrite pipeline launch page website#2015
    enhancement +1
    

These issues typically affect all of the following:

Tooling updates

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1. nf-core schema build
2. nf-core schema lint
3. Rewrite schema build page #2463
   schema +1
   
4. Rewrite terminal version of nf-core launch #2464
   command line tools +1
5. Rewrite pipeline launch page website#2015
   enhancement +1
   
6. Pipeline template validation code (nextflow run ... with the nf-validation plugin)
7. Pipeline template help text (nextflow run ... --help with the nf-validation plugin)