Add table.cell_set_text_formatting and table.cell text_formatting

[lenstrats]

Problem

table.cell_set_text_formatting() is not implemented or bound in Context, so scripts that call it fail. table.cell() also ignores the v6 text_formatting argument.

//@version=6
indicator("repro", overlay = true)
var t = table.new(position.top_right, 1, 1)
if barstate.islast
    table.cell(t, 0, 0, "x", text_formatting = text.format_bold)
    table.cell_set_text_formatting(t, 0, 0, text.format_italic)
plot(close)

→ TypeError: table.cell_set_text_formatting is not a function

This script compiles on TradingView. 1 of 729 popular open-source indicators failed on this (Parabolic SAR Constraint Kinematics & Run Geometry).

Fix

This mirrors cell_set_text_font_family:

• table.cell() now reads text_formatting, both positionally (index 13) and as a named argument. It is stored on the cell with default "none", matching text.format_none, and added to TABLE_CELL_PARAMS.
• Add cell_set_text_formatting to TableHelper and to the TableObject delegate, and bind it in Context.
• Update the API coverage docs (table.md, pinescript-v6/table.json).

Tests

• tests/namespaces/table/table.test.ts: the namespace setter and the method delegate, plus a native Pine script covering text_formatting in table.cell(). The Pine script compiles on TradingView.
• The new tests fail on dev (table.cell_set_text_formatting is not a function) and pass with this change. table-named-args.test.ts still passes. Full suite: 1840 passed, 5 skipped, 16 todo.
• Real indicators: the affected indicator now runs without errors (60 labels, 1 table).
• Differential check: all 729 indicators were run on identical cached market data within the same clock hour, once against dev and once against this branch. The affected indicator now runs without errors. No regressions. The only changed output values are in 6 scripts that use timenow or math.random; their output also differs between two identical dev runs. Output was compared with the text_formatting key left out, because this change adds that key to every table cell.

The repro scripts and tooling are in https://github.com/lenstrats/pinets-compat.

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[lenstrats]

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