SeqN Add activate and load to immediate_commands

[goetzrrGit]

Allow activate and load to be used in the @immediate section of a seqN, enabling the generation of 'immediate_activate' and 'immediate_load' in the SeqJson defined by this ticket: https://github.com/NASA-AMMOS/seq-json-schema/issues/25. This would result in the following syntax:

@immediate
load('seq_name')
activate('seq_name')

[dandelany]

There is a PR for this in the schema repo here: https://github.com/NASA-AMMOS/seq-json-schema/pull/26

Todo list for release:

• [x] merge schema PR
• [x] publish latest schema version to npm/pip registries
• [ ] Update jpl_sequence to support new version - @cartermak
• [ ] Update aerie-ui to support new version
  • [ ] change seq-json-schema version in package.json
  • [ ] update SeqN grammar
• [ ] Update aerie backend to support new version
  • [ ] change seq-json-schema version in package.json of sequencing server
  • [ ] other changes needed in EDSL/sequencing server?
• [ ] Include in (Aerie) release notes

[cartermak]

Re: jpl-sequence, that shouldn't be a blocker to this feature.