[IMP] l10n_in: Improve Indian localization to supports GSTR-1 reports

Purpose
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GST Invoice Report required to show tax amount product line wise.
This Tax amount is divided in CESS and IGST or CGST and SGST.

Improve GST Tax, Tax Groups and Tag.

Reverse charge under GST
As per GST rules tax will have to be paid directly by the receiver to the Government instead of the supplier.

Reseller(E-commerce) under GST
If you sale through ecommerce then need to specify ecommerce GSTIN.

Import/Export goods under GST
If you export the goods then need to specify
    -Export Type
    -Shipping bill number
    -Shipping bill date
    -Shipping port code

Credit or Debit Note
If u give Credit or Debit note then need to specify Refund reason.

Place of Supply is the state of customer.

Added GSTR reports

GSTR Invoice report covers below GSTR-1 sections(this report is grouped by tax rate and journal entries
B2B, B2CL, B2CS, EXP, CDNR and CDNUR

GSTR payment report
This report is covered under GSTIR-1 section called AT(advance payment) and ATADJ(advance payment adjustment)

GSTR HSN report(it is based on the product HSN code)

GSTR Exempted report(it is based on nil rated and exempt tax)
This report is covered under GSTIR-1 section EXEMP

Added demo data to to have GSTR-1 reports out of the box

Solution
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fetched values of CESS, IGST, CGST and SGST amount in invoice report from tax groups

added new taxes called "Nil Rated" and "Exempt" and also added it's related tax groups and accounts
added tax tags related to GST tax percentage

Set Reverse charge in negative tax

Improved account move line creation grouping machenism:
Now, move lines related to tax are grouped by product and uom instead of grouping them just by tax(this is for better reporting)

closes odoo/odoo#30332

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