feat: two new groupby mode on gross profit: Monthly, Payment Term

[HarryPaulo]

I created two new grouping ways:

Monthly: The grouping is based on the Month / Year, allowing an evolution view for the user with the results of each month of the chosen filter

Demo: https://prnt.sc/BqpVgZyPnbov

Payment Term: This mode presents the profitability based on the payment schedule from sales invoice and group by Payment Term, with 2 fixed types:

Sales Return: whenever there is a sales return, this text will be assigned, as returns do not have a "Payment Schedule"

No Terms: When a sales invoice is made and the payment terms are not informed.

Demo: https://prnt.sc/aOsAzWQ-WZPb

no-docs

[codecov]

Codecov Report

Merging #31198 (c4af63a) into develop (a1b7a79) will increase coverage by 0.04%.
The diff coverage is 42.10%.

@@             Coverage Diff             @@
##           develop   #31198      +/-   ##
===========================================
+ Coverage    63.29%   63.34%   +0.04%     
===========================================
  Files          986      986              
  Lines        67367    67395      +28     
===========================================
+ Hits         42642    42688      +46     
+ Misses       24725    24707      -18     

Impacted Files	Coverage Δ
...pnext/accounts/report/gross_profit/gross_profit.py	73.06% <42.10%> (-7.19%)	⬇️
.../report/delayed_item_report/delayed_item_report.py	60.78% <0.00%> (-35.30%)	⬇️
...rial_no_valuation/incorrect_serial_no_valuation.py	85.96% <0.00%> (-10.53%)	⬇️
...pnext/setup/doctype/sales_partner/sales_partner.py	65.21% <0.00%> (-4.35%)	⬇️
erpnext/hr/doctype/job_applicant/job_applicant.py	63.93% <0.00%> (-3.28%)	⬇️
...e_sales_analytics/supplier_wise_sales_analytics.py	86.88% <0.00%> (-3.28%)	⬇️
...next/accounts/doctype/bank_account/bank_account.py	77.27% <0.00%> (-2.28%)	⬇️
erpnext/stock/doctype/warehouse/warehouse.py	79.02% <0.00%> (-2.10%)	⬇️
...eorder_level/itemwise_recommended_reorder_level.py	90.74% <0.00%> (-1.86%)	⬇️
erpnext/crm/doctype/prospect/prospect.py	56.71% <0.00%> (-1.50%)	⬇️
... and 21 more