fix(data): include missing fields in activity output

[RajMandaliya]

Fixes #29

Problem

The data activity command was silently dropping several fields that are
present on the Activity struct and returned by the underlying REST API.
Most critically, the side field (BUY/SELL) was absent from JSON output,
making it impossible for scripts and agents to distinguish buy trades from
sell trades for non-CLOB activity records.

Changes

Single change to src/output/data.rs:

JSON output now includes: side, price, asset, outcome, outcome_index, condition_id, slug
Table output now includes: Side, Outcome, Price columns

Testing

• All 93 existing tests pass (1 pre-existing failure in upgrade unrelated to this change)
• Added 2 integration tests for the data activity subcommand

Notes

All added fields are Option<_> on the Activity struct so this is fully
backwards compatible. No changes to the SDK, commands layer, or request types.

---

Note

Low Risk
Low risk, additive CLI output changes only; main impact is that scripts depending on the exact data activity JSON/table schema may need to tolerate the new fields/columns.

Overview
Fixes data activity output to stop dropping Activity fields needed to interpret trades and market/outcome identity.

print_activity now includes additional optional fields in JSON output (side, price, asset, outcome, outcome_index, condition_id, slug) and adds Side/Outcome/Price columns to the table output, with new CLI integration tests covering data activity --help and required address validation.

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