Add Exchange Rate Connector SDK example

[fivetran-meetmahna]

Jira ticket

Closes <ADD TICKET LINK HERE, EACH PR MUST BE LINKED TO A JIRA TICKET>

Description of Change

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Testing

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Checklist

Some tips and links to help validate your PR:

• Tested the connector with fivetran debug command.
• Added/Updated example-specific README.md file, see the README template for the required structure and guidelines.
• Followed Python Coding Standards, refer here

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