Add SDK features for v4.12.0

[jessicahearn]

Summary

• Add Account include parameter for optional settings
• Add DataSource empty! and soft_purge! methods for data management
• Add Invoice update!, toggle_disabled!, update_status! methods
• Add SubscriptionEvent toggle_disabled! method
• Add standalone Transaction resource with CRUD and toggle_disabled!
• Add standalone LineItem resource with CRUD and toggle_disabled!
• Add external ID lookup methods (*_by_external_id) for Invoice, Transaction, LineItem, and SubscriptionEvent
• Add JsonImport resource for bulk JSON imports
• Add Upload resource for CSV file uploads (requires faraday-multipart)

New Features

Account include parameter

account = ChartMogul::Account.retrieve(include: %w[churn_recognition refund_handling])
account.churn_recognition  # => "churn_at_time_of_cancelation"

DataSource operations

ds = ChartMogul::DataSource.retrieve('ds_uuid')
ds.empty!       # Delete all data from the data source
ds.soft_purge!  # Clear for reimport

toggle_disabled! for Invoice, Transaction, LineItem, SubscriptionEvent

invoice = ChartMogul::Invoice.retrieve('inv_uuid')
invoice.toggle_disabled!(disabled: true)

External ID lookups (via data_source_uuid + external_id)

txn = ChartMogul::Transaction.retrieve_by_external_id(
  data_source_uuid: 'ds_uuid',
  external_id: 'txn_123'
)

JsonImport for bulk imports

import = ChartMogul::JsonImport.create!(
  data_source_uuid: 'ds_uuid',
  customers: [...],
  invoices: [...]
)
status = ChartMogul::JsonImport.retrieve(data_source_uuid: 'ds_uuid', id: import.id)

Upload for CSV files

ChartMogul::Upload.create!(
  data_source_uuid: 'ds_uuid',
  file: '/path/to/file.csv',
  type: 'invoices'
)

Test plan

• SDK loads successfully with all new classes
• Manual testing against ChartMogul API
• Add unit tests for new features

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