Handled Pending Payment state (fixes putNameReservation() error)

[severinbeauvais]

Issue #: /bcgov/entity#6170

Description of changes:

• updated version to 0.3.1
• used NrState (enum) for NR states (multiple places)
• deleted obsolete submit() (2 instances)
• used PaymentStatus for payment statuses (multiple places)
• replaced Payment Status "model" with new enum
• fixed typo in Cond Reserved state
• added Pending Payment state
• handled Pending Payment state on put

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[severinbeauvais]

Looks great! What was the specific culprit causing the sentry error?

The PENDING_PAYMENT state was not handled, so data was not set to anything... which caused the network call to fail.