Docs about Lifecycle Hooks on each operation

[tabacitu]

In v7.x we've added Lifecycle Hooks, which are documented in 7.x-dev/release-notes.md#crud-lifecycle-hooks - but they very much concern operations too.

On the other hand, each operation page (eg. 7.x-dev/crud-operation-list-entries.md) has a section called "How to Override". I think it would be very useful to add a new section there, on each operation page, called "Lifecycle Hooks", that would document what hooks are available in that operation - both the general ones and the operation ones.

Todo in:

• List operation
• Create operation
• Update operation
• Delete operation
• Show operation
• Clone operation
• Reorder operation
• Revise operation
• Fetch operation
• InlineCreate operation
• Fetch operation