:bar_chart: Update IMF expenditure data in the long run

[paarriagadap]

Upload an updated version of IMF's dataset to correct a problem in the calculation of the data made 7 years ago.

This is a very straightforward code, mostly from Wizard.

Main issue https://github.com/owid/owid-issues/issues/1567

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• Create object ChartDiffLoader to assist the loading and retrieval of ChartDiff objects.
• Optimisation of chart-diff loading: run SQL queries for a batch of charts. Results in 85% improvement in computation time.

[owidbot]

Quick links (staging server): Site	Admin	Wizard

Login: ssh owid@staging-site-update-govt-expenditure-data-imf

chart-diff: ✅

• 4/4 reviewed charts
• Modified: 3/3
• New: 1/1

data-diff: ✅ No differences found

```diff + Dataset garden/imf/2024-06-12/public_finances_modern_history + + Table public_finances_modern_history + + Column gg_budg + + Column gg_debt + + Column revenue + + Column expenditure + + Column interest_exp + + Column prim_expenditure + + Column prim_balance + + Column debt + + Column rltir + + Column rgc + Dataset garden/pew/2024-06-03/same_sex_marriage + + Table same_sex_marriage + + Column legal_status + + Column legal_status_legal_count + + Column legal_status_not_legal_pop + + Column legal_status_legal_pop Legend: +New ~Modified -Removed =Identical Details Hint: Run this locally with etl diff REMOTE data/ --include yourdataset --verbose --snippet ``` Automatically updated datasets matching _weekly_wildfires|excess_mortality|covid|fluid|flunet|country_profile|garden/ihme_gbd/2019/gbd_risk_ are not included

Edited: 2024-06-17 16:04:51 UTC Execution time: 14.23 seconds

[lucasrodes]

I'm taking over this branch for some days to try to fix some issues with chart leakage into chart-diff