[REF] stock_account: standard cost method with valuation layers

Valuation of standard move: We introduce _create_in_svl and
_create_out_svl and call these method in _action_done only on the
standard move, the other valuation methods still use the old code. We
hijack _account_entry_move to create journal entries anyway for the
valuation layer with a minimal diff. Helpers for the valuation layers
creation are added on the product because we will need to create similar
layer without stock move later on when we'll implement changes of cost
method. We also make a first implementation of the edition in the past
to make some tests pass, it will be completed with other cost method
implementation

Change of standard price: Before this commit, the wizard to change the
standard price was only displayed in perpetual, because it was used to
create accountign entries. We also use this wizard in manual now,
because we want to create a stock valuation layer. Fortunetaly, the
accounting fields of this wizard are not required if the product has a
manual valuation. And the new method is private.

We adapt the existing tests as well as we can and include the start of a
new battery of tests: test_stockvaluationlayer.py

task-1875873

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