Add new API integration: /cash-flow-statement-growth-bulk

[sorndotdev]

Instructions
Replace all example values below with your actual implementation details. Do not keep the examples as-is. Make
sure to read the full documentation before contributing.

---

FMP Docs Link:
Replace with the direct link to the relevant endpoint in the Financial Modeling Prep docs

https://site.financialmodelingprep.com/developer/docs/stable#cash-flow-statement-growth-bulk

Parameters:
Replace with the required and optional endpoint parameters (or N/A)

• Required: year, period
• Optional: none

Proposed model class name:
Replace with the name of the model class you plan to add

FmpCashFlowStatementGrowth

Proposed client class name:
Replace with the name of the client class

FmpBulkClient

Proposed client method names:
Replace with the method names in the client

• cashFlowStatementGrowth()

---

Requirements

All models

• start with Fmp
• are implemented as Java 16+ records
• implement the FmpModel interface
• have serialVersionUID
• have test: is_serializable
• have test: serializes
• use date time classes for dates, instead of strings, where appropriate
• use value objects, instead of strings, where appropriate
• have *TestData in testFixtures

All services

• use the model name + Service suffix
• are added to the appropriate FmpClient
• have tests with real responses from FMP
• with responses stored as JSON in testFixtures (for large responses, include only an excerpt)

General

• aim for 100% test coverage; TDD is preferred
• double-check your work before creating a PR
• refactor unrelated code in a separate PR from feature or bugfix changes (don’t refactor "as you go")
• adhere to the existing code style

[lukinoo0]

Can you please assign this issue to me? I would like to contribute the implementation.

[sorndotdev]

@lukinoo0 please confirm you're working on it

[lukinoo0]

Yes, I am working on it, no worries.