refactor: SLE submission execution flow

[ankush]

Currently, this is how SLEs get submitted:

Document controller -> stock controller -> stock_ledger.py -> stock/utils.py -> bin.py -> stock_ledger.py 🥴🥴🥴

update_bin in bin.py for some reason does a lot more than "UPDATE BIN"... inlined/replaced all the intermediate functions called after creating SLE.

Changes:

• Bin.py now only has code that modifies Bin and nothing else.
• make_sl_entries mostly executes inside a single file now instead of jumping across 3 files.

New simplified execution flow:
Document controller -> stock controller -> stock_ledger.py

TODO:

• Replaces other lesser used references with new functions
• deprecate old functions / re-route internally.

[codecov]

Codecov Report

Merging #28705 (3288b18) into develop (0b1808e) will decrease coverage by 0.01%.
The diff coverage is 72.00%.

@@             Coverage Diff             @@
##           develop   #28705      +/-   ##
===========================================
- Coverage    55.21%   55.19%   -0.02%     
===========================================
  Files         1121     1121              
  Lines        66785    66792       +7     
===========================================
- Hits         36872    36867       -5     
- Misses       29913    29925      +12     

Impacted Files	Coverage Δ
erpnext/stock/doctype/bin/bin.py	87.27% <25.00%> (-4.54%)	⬇️
erpnext/stock/utils.py	65.27% <33.33%> (-2.10%)	⬇️
erpnext/stock/stock_ledger.py	85.46% <88.88%> (+0.16%)	⬆️
...eport/item_variant_details/item_variant_details.py	31.32% <0.00%> (-53.02%)	⬇️
...xt/stock/report/stock_analytics/stock_analytics.py	91.08% <0.00%> (-2.98%)	⬇️
erpnext/stock/report/stock_ageing/stock_ageing.py	89.78% <0.00%> (-2.92%)	⬇️
.../report/stock_projected_qty/stock_projected_qty.py	86.84% <0.00%> (-2.64%)	⬇️
...eorder_level/itemwise_recommended_reorder_level.py	92.30% <0.00%> (-1.93%)	⬇️
erpnext/stock/report/stock_ledger/stock_ledger.py	76.42% <0.00%> (-1.63%)	⬇️
...ctype/accounting_dimension/accounting_dimension.py	64.06% <0.00%> (-1.57%)	⬇️
... and 20 more