support for fetching user insights reports

[mrmauer]

Tests

tested with example app

After PR

you can do this:

top_inviters_page = auth.fetch_user_top_inviter_report(
    report_interval = TopInviterReportInterval.THIRTY_DAYS,  # defaults to 30 days
    page_size = 10, # default 10 for all report fetches
    page_number = 0, # defaults 0 for all report fetches
)

champions_page = auth.fetch_user_champion_report(
    report_interval = ChampionReportInterval.THIRTY_DAYS,  # defaults to 30 days
)

user_churn_page = auth.fetch_user_churn_report(
    report_interval = ChurnReportInterval.SEVEN_DAYS,  # defaults to 7 days
)

user_reengagement_page = auth.fetch_user_reengagement_report(
    report_interval = ReengagementReportInterval.WEEKLY,  # defaults to weekly
)

org_churn_page = auth.fetch_org_churn_report(
    report_interval = ChurnReportInterval.SEVEN_DAYS,  # defaults to 7 days
)

org_reengagement_page = auth.fetch_org_reengagement_report(
    report_interval = ReengagementReportInterval.WEEKLY,  # defaults to weekly
)

org_growth_page = auth.fetch_org_growth_report(
    report_interval = GrowthReportInterval.THIRTY_DAYS,  # defaults to the last 30 days
)

org_attrition_page = auth.fetch_org_attrition_report(
    report_interval = AttritionReportInterval.THIRTY_DAYS,  # defaults to the last 30 days
)

import datetime as dt
timeseries_of_daily_signups = auth.fetch_chart_metric_data(
    chart_metric = ChartMetric.SIGNUPS,
    cadence = ChartMetricCadence.DAILY, # defaults to daily
    start_date = dt.date.fromisoformat('2026-01-01'), # defaults to 30 days ago
    # end_date defaults to today, but the most recently available results will be yesterday
)

[pfvatterott]

LGTM!