GDPR - Personal data export and removal

[mikejolley]

This PR integrates WooCommerce with the patch proposed in https://core.trac.wordpress.org/ticket/43546 You'll need to be running the development branch with that patch applied to see this in action.

Whats in this PR:

• A bulk action to remove personal data from orders manually. When trigger, all data is anonymized.
• Export integration with https://core.trac.wordpress.org/ticket/43546 which exports customer data, order data, downloads, and download logs.
• A remove personal data callback. This is not yet hooked into WP UI as it's still unfinished.
• A foreign key on permission_id/logs so logs are cleaned up when download permissions are removed (@kloon can you see anything wrong with this?)

[mikejolley]

Order ID being included here could add context.

Also need to get _billing_address_index meta.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@718c91f). Click here to learn what that means.
The diff coverage is 34.96%.

@@            Coverage Diff            @@
##             master   #19330   +/-   ##
=========================================
  Coverage          ?   38.65%           
  Complexity        ?    12891           
=========================================
  Files             ?      349           
  Lines             ?    48062           
  Branches          ?        0           
=========================================
  Hits              ?    18577           
  Misses            ?    29485           
  Partials          ?        0

Impacted Files	Coverage Δ	Complexity Δ
includes/wc-core-functions.php	43.77% <ø> (ø)	0 <0> (?)
...n/list-tables/class-wc-admin-list-table-orders.php	0% <0%> (ø)	109 <0> (?)
includes/class-woocommerce.php	8.93% <0%> (ø)	66 <0> (?)
.../admin/meta-boxes/class-wc-meta-box-order-data.php	0% <0%> (ø)	68 <0> (?)
includes/class-wc-privacy.php	53.09% <53.09%> (ø)	23 <23> (?)

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[claudiulodro]

Code looks good and the features work well. I've resolved merge conflicts and am merging this.