Item field mapping

[dvdl16]

Description

Makes it possible to map fields that you want to be synchronised on Item. For example, to synchronise a WooCommerce Product's short_description field to an ERPNext Item's description field, add a Field Mapping on WooCommerce Server

Type of change

• ⚪ Bug fix (change which fixes an issue)
• 🟢 New feature (change which adds functionality)
• ⚪ Breaking change (fix or feature that would cause existing functionality to not work as expected)

Tests

• [x] Unit Tests have been updated or added, as required
• [ ] UI Tests have been updated or added, as required

Checklist:

• [x] My code follows Naming Guidelines (DocType, Field and Variable naming)
• [x] No Form changes / My code follows the Form Design Guidelines
• [x] My code follows the Coding Standards of this project
• [x] My code follows the Code Security Guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas / No comments necessary
• [x] I have made corresponding additions/changes to the documentation
• [x] All business logic and validations are on the server-side / No business logic or validation changes
• [x] No patches are necessary / Migration Patches have been added to the correct subdirectory of /patches and patches.txt have been updated

User Experience:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.07143% with 19 lines in your changes missing coverage. Please review.

Project coverage is 78.10%. Comparing base (2cc50a5) to head (67ac7b3).

Files	Patch %	Lines
woocommerce_fusion/tasks/sync_items.py	69.44%	11 Missing :warning:
...e/doctype/woocommerce_server/woocommerce_server.py	50.00%	4 Missing :warning:
...doctype/woocommerce_product/woocommerce_product.py	0.00%	3 Missing :warning:
woocommerce_fusion/__init__.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## version-15 #96 +/- ## ============================================== - Coverage 78.24% 78.10% -0.15% ============================================== Files 23 24 +1 Lines 1255 1306 +51 ============================================== + Hits 982 1020 +38 - Misses 273 286 +13 ```

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