feat(event): expand 'event list' to support org-scoped Discover/Events queries

[BYK]

Background

PR #671 added sentry event list <issue-id> for issue-scoped event listing. This issue tracks expanding it to support org-wide and project-scoped event queries via the Sentry Discover/Events API.

Proposed Usage

# Org-scoped: list error events across all projects
sentry event list my-org/ --dataset errors

# Project-scoped: list events for a specific project
sentry event list my-org/my-project/ --dataset errors

# With search query
sentry event list my-org/ --dataset transactions -q "transaction:/api/users"

# Specific fields
sentry event list my-org/ --dataset spans --field id --field timestamp --field description

Design Considerations

The Discover API (GET /organizations/{org}/events/) has dynamic response fields — the shape depends on which field params are requested. This differs from every other list command which has fixed table columns.

Key decisions needed:

1. Default field sets per dataset — Each dataset (errors, transactions, spans, logs) should have sensible default columns if --field isn't specified
2. Dynamic table rendering — The table formatter needs to handle arbitrary field sets
3. Dataset flag — --dataset to select which event type (errors, transactions, spans, logs, discover)
4. --field flag — Repeatable flag to specify which columns to query/display
5. SDK type gap — The @sentry/api SDK's typed dataset parameter only accepts logs | profile_functions | spans | uptime_results. Datasets like errors and transactions require raw apiRequestToRegion calls.

Existing Infrastructure

• src/lib/api/traces.ts — Already calls /events/?dataset=transactions and dataset=spans
• src/lib/api/logs.ts — Already calls queryExploreEventsInTableFormat with dataset=logs
• src/lib/api/dashboards.ts — Most generic usage, maps widget types to datasets
• sentry api organizations/{org}/events/ -F dataset=errors -F field=id — Works today as escape hatch

Implementation Plan

1. Create a generic queryEvents() function in src/lib/api/events.ts that wraps the Discover endpoint
2. Define default field sets per dataset in a config map
3. Add --dataset and --field flags to event list
4. Detect the target mode from positional args: issue ID vs org/ vs org/project/
5. Use dynamic table columns when field sets are custom
6. Handle pagination (cursor-based, same as other list commands)