[1] - added Distributional impact by income

[masterismail]

usage

from policyengine import EconomicImpact

impact = EconomicImpact(reform={
  "gov.hmrc.income_tax.rates.uk[0].rate": {
    "2024-01-01.2100-12-31": 0.55
  }},country="uk")

average =impact.calculate("distributional/by_income/average")

relative = impact.calculate("distributional/by_income/relative") 

print(
    f"average: {budgetary_impact} \n"
    f"relative: {benefit_spending_impact} \n"
)

output

average: {'average': {1: -288.4419422028393, 2: -936.7849231542535, 3: -1655.8066942572789, 4: -3040.3849413280304, 5: -5082.727697456715, 6: -8483.137124053015, 7: -11510.447500088267, 8: -14567.684605663524, 9: -17960.33204429504, 10: -22070.767989875396, 11: -13195.0}} 
relative: {'relative': {1: -0.026265868982450032, 2: -0.05321454070727573, 3: -0.07293061898874185, 4: -0.1046825029478255, 5: -0.1407466605531786, 6: -0.19129333726780962, 7: -0.2185085314786923, 8: -0.22920465056330844, 9: -0.21991139800089637, 10: -0.12790076021888797, 11: -0.007019584080998393}}