SEQN Grammar: Add auto-formatting capabilities for seqn

[shaheerk94]

Checked for duplicates

No - I haven't checked

Alternatives considered

No - I haven't considered

Related problems

seqn can be hard to read when there are tags attached to commands:

C USER_SEQ_DIR_MULTIPLY Htarget momentum_bound negative_one 
@METADATA "ASSUMED_MODEL_VALUES" "TELEMETRY::GNC_MME_MOM_RWA_IF_1 = 10, 00:00:00.000"
C USER_SEQ_DIR_LV_SET_TELEM Hx "GNC_MME_MOM_RWA_IF_1" 

Describe the feature request

Propose adding an auto-formatter for seqn that a user can run on a sequence to auto-format sequences to a specific format style. This should at least:

• Correct indenting for conditionals and loops
• Correct indenting for tags attached to commands
• Correct spacing within a line, for example, between time tags, commands, and arguments
• Correct indenting for requests

UPDATE:
Chet told me there does already exist a sequence_auto_indent function that is applied on import and can be applied via keyboard shortcut and on import. So we may get this for free already! I think we might still want a button to do this instead of only relying on keyboard shortcuts or re-opening. Still would like @metadata tags to get indented as well.