fix: purchase invoice performance issue

[rohitwaghchaure]

1. Enabled search index for fields 'purchase_receipt_item' and 'purchase_invoice_item' in the doctype 'Purchase Receipt Item'
2. Get invoiced amount based on purchase receipts and Get returned quantity based on purchase receipts are running in the for loop which causing the performance issue

[stale]

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[codecov]

Codecov Report

Merging #33722 (4726448) into develop (6b3028d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #33722   +/-   ##
========================================
  Coverage    63.89%   63.89%           
========================================
  Files          817      817           
  Lines        59337    59348   +11     
========================================
+ Hits         37912    37922   +10     
- Misses       21425    21426    +1     

Impacted Files	Coverage Δ
...ounts/doctype/purchase_invoice/purchase_invoice.py	84.09% <100.00%> (+0.18%)	⬆️
...stock/doctype/purchase_receipt/purchase_receipt.py	92.97% <100.00%> (+0.05%)	⬆️
erpnext/stock/doctype/serial_no/serial_no.py	89.20% <0.00%> (-0.24%)	⬇️