[ADD] purchase_line_sale_history: Sales history on purchase order lines

[alan196]

Add a Sales History toggle on purchase order lines that displays, below the order lines, a year x month pivot table with the quantities of the line's product sold in posted customer invoices (credit notes subtracted). Only one line per order can be active at a time (enforced live in the form via onchange and at API level via create/write), the history is computed on the exact product variant, and the number of past years shown is configurable in the purchase settings (default: 2).

[jarsabot]

    **WARNING**: Could not link to Odoo task. Record ID not found in the title of the MR, supported formats:

{ record type }#{ number }

Available types: 'task#', 't#' (case insensitive)

Examples:

• task#123

• i#123

[jarsabot]

    **WARNING**: Could not link to Odoo task. Record ID not found in the title of the MR, supported formats:

{ record type }#{ number }

Available types: 'task#', 't#' (case insensitive)

Examples:

• task#123

• i#123

[jarsabot]

    **WARNING**: Could not link to Odoo task. Record ID not found in the title of the MR, supported formats:

{ record type }#{ number }

Available types: 'task#', 't#' (case insensitive)

Examples:

• task#123

• i#123