[MERGE] account: Split Invoicing/Accounting + Move account_accountant to enterprise

This include mainly the 3 following changes:

1/ [IMP] account: Isolate `group_account_user` in account
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Purpose
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We want to clear the accounting access groups when only the Invoicing application is installed as follows:

If only Invoicing is installed, we should only have 2 groups: `Billing` and `Billing Manager`
If Accouting and Finance is installed, we should have the current groups: `Billing`, `Accountant` and `Advisor`

Specification
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1/ If we have only Invoicing the should have the following hierarchy:

group_account_manager (Billing Manager) ---Implies---> group_account_invoice (Billing)

group_account_user (Accountant) is a technical group out the Accouting groups hierarchy

2/ If we have Accouting and Finance installed, we should then have:

group_account_manager (Advisor) ---Implies---> group_account_user (Accountant) ---Implies---> group_account_invoice (Billing)

The reason we want to keep the group_account_user is that we will hide the accouting fields (account_id,...) with this group, allowing the consultants to show the accouting related information on support.

2/ [IMP] account: Split clearly the accounting & invoicing applications
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PURPOSE
=======

1) Have a clear split between the invoicing and the accounting apps
2) Have a clear split between the community and the enterprise version (no accounting in community)

SPECIFICATION
=============

(1) When only invoicing installed, we shouldn't see accounts (for community and enterprise)
(a) Perpetual Inventory Valuation:
     - Hide the field inventory valuation from the product category
(b) Taxes
- No accounts
- No cash basis option
- No tax adjustment

(2) Remove from Community, modules:
- Accounting
- Budgets
- Assets

(3) No account_report in community, keep PDF reports for
- sale/purchase journal
- Aged partner balance
- Partner Ledger

(4) Clean split between invoicing and accounting in enterprise
(a) When installing invoicing, I shouldn't have access to accounting just by changing my access right to adviser
(b) Menus (when only invoicing installed)
- Sales
    - Customer Invoices
    - Customer Credit Notes
    - Payments
    - Customer Statements
    - Customers
    - Sellable Products
- Purchases
    - Vendor Bills
    - Vendor Credit Notes
    - Payments
    - Vendors
    - Purchasable Products
- Reporting
    - Partner Reports
        - Partner Ledger
        - Aged Receivable
        - Aged Payable
    - Audit Reports
        - Tax report
    - Management
        - Invoices
        - Product Margins
- Configuration
    - Settings
    - Products
        - Products
    - Accounting
        - Taxes
        - Fiscal Positions
        - Bank Accounts
        - Journals
    - Management
        - Payment Terms
        - Follow-up levels
    - Payments
        - Payment Acquirers
(c) Settings (when only invoicing installed)
- Fiscal Localization
- Taxes
    - Default Taxes
    - Rounding Method
    - TaxCloud connection
    - TaxCloud Categories
    - EU Digital Goods VAT
    - VIES VAT CHECK
- Currencies
    - Main currency
    - Multi-currencies
- Invoicing
    - Warnings
    - Docsaway
- Customer Payments
    - Follow-up levels
    - Payment Followup
- Bills Payment
- Bank & Cash
- Analytics
    - Margin
- Automated Entries

Remarks
- Test with the different access rights

3/ [MOV] account_accountant: Move module to enterprise
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