Feat/interactive examples market information

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Summary

Adds two new categories to interactive_examples/ — Fundamentals Analysis and Market Information — mirroring the existing CLI + Streamlit pattern, so
every sub-page in the Upstox Fundamentals and Market Information docs has a runnable example.

Fundamentals Analysis (8 endpoints)

CLI scripts under interactive_examples/fundamentals/ + Streamlit branches:

• Company Profile, Key Ratios, Balance Sheet, Income Statement, Cash Flow, Corporate Actions, Share Holdings, Competitors

Endpoints with optional query params are exposed as Streamlit filters with API defaults pre-selected:

• Balance Sheet / Cash Flow — type (consolidated | standalone), fs (false | true)
• Income Statement — type, time_period (yearly | quarterly), fs

When fs=true, an additional Full Statement (detailed line items) pivot table (Particular × Periods) is rendered below the summary view.

Corporate Actions now pivots event_details[] into separate columns per detail name instead of packing them into one string, so the table is readable.

Market Information (6 new + 3 existing)

New CLI scripts under interactive_examples/market_information/:

• FII Data, DII Data, OI, Change in OI, Max Pain, PCR

Plus the existing Market Holidays / Market Timings / Exchange Status surfaced under the same Streamlit category. Each multi-param endpoint exposes every SDK
param as a filter (segment, interval, from, underlying, expiry, date, bucket, lookback) with sensible defaults — expiry/date use st.date_input (default =
today + 7 days for expiry, today for date).

Streamlit responses are flattened defensively (handles dict-of-segment shapes for FII/DII and decodes time_stamp epoch-ms → IST date) and any nested
list/dict columns are dropped before render to avoid [object] cells.

Other changes

• test_runner.py: adds 14 new rows (6 Market Information, 8 Fundamentals) and a _next_thursday() helper for OI / Max Pain / PCR expiry defaults; category
  count bumped to 10.
• README.md: new sections documenting both categories with sample commands.