feat: add get_taxonomy_by_export_id method [FC-0049]

[rpenido]

Description

This PR adds a get_taxonomy_by_export_id method. This method will be used in to import taxonomy data.

Supporting information

• Part of: [Tagging] Pasting XBlocks containing Tag data in clipboard modular-learning#180

Testing Instructions

• Please ensure that the tests cover the expected behavior

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Private ref: FAL-3621

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[yusuf-musleh]

@rpenido This looks good to me, great work! 👍

• I tested this: I confirmed the tests check for the functionality
• I read through the code
• I checked for accessibility issues
• Includes documentation
• I made sure any change in configuration variables is reflected in the corresponding client's configuration-secure repository.

[pomegranited]

👍 -- @rpenido could you push a version bump, and I can merge & tag a new release.

• I tested this on my devstack shell.
• I read through the code
• I checked for accessibility issues N/A
• Includes documentation
• User-facing strings are extracted for translation N/A

[rpenido]

👍 -- @rpenido could you push a version bump, and I can merge & tag a new release.

Done: 0b9a9d7

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