Add computed field.

Adds node read time computed field.

added 15 commits

• 2f2cfb37...eb19abbc - 11 commits from branch project:8.x-1.x
• 5f758f0d - 3171641: Initial commit for JSON API.
• 0bb9337f - 3171641 - Clear words after calculation
• 34e379eb - 3171641 - Set target entity_type id.
• 0c72a0cd - 3171641 - Update node_read_time definition.

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merged