feat(bindings): tnumber arithmetic operators (+, -, *, /) — 24 registrations

[estebanzimanyi]

Summary

Adds 24 ScalarFunction registrations for tnumber arithmetic across both base types (tint, tfloat) and all three operand-shape patterns:

Operator	Shape	Type pair
+, -, *, /	value op tnumber	INTEGER op tint, DOUBLE op tfloat
+, -, *, /	tnumber op value	tint op INTEGER, tfloat op DOUBLE
+, -, *, /	tnumber op tnumber	tint op tint, tfloat op tfloat

Backed by 20 MEOS bindings (add_int_tint, add_tint_int, add_float_tfloat, add_tfloat_float, add_tnumber_tnumber, and the same 5 variants for sub_*, mult_*, div_*).

Implementation

Reuses the templated wrapper helpers from PR #27 (TemporalUnary, TemporalBinaryV, TemporalBinaryV1, TemporalBinaryTT), keeping each ScalarFunction body to one line. Each MEOS function is called via the matching helper template specialisation.

Smoke test

SELECT 1 + tint '1@2000-01-01';                                 -- 2@2000-01-01 00:00:00+00
SELECT tint '[1@2000-01-01, 5@2000-01-05]' + 10;                -- [11@..., 15@...]
SELECT 2.5 * tfloat '1.5@2000-01-01';                            -- 3.75@2000-01-01 00:00:00+00
SELECT tfloat '[1@2000-01-01, 4@2000-01-04]' / 2;               -- [0.5@..., 2@...]
SELECT tint '[1@2000-01-01, 5@2000-01-05]' - tint '[1@2000-01-01, 1@2000-01-05]';
                                                                -- [0@..., 4@...]
SELECT tfloat '[2@2000-01-01, 4@2000-01-04]' * tfloat '[1@2000-01-01, 2@2000-01-04]';
                                                                -- linear-interpolated product

Test plan

• make release then TZ=UTC ./build/release/test/unittest "<proj>/test/*" — full suite passes.
• When this lands (after PR feat(bindings): tbool boolean operators + ttext text functions (13 functions) #27), PR test(parity): batch 2 — boolops / textfuncs / compops / posops / aggfuncs #24's 026_tnumber_mathfuncs.test skip block unwraps into ~6 active assertions covering value-op-tnumber, tnumber-op-value, and tnumber-op-tnumber across all 4 operators.

Dependencies

Stacked on PR #27 (reuses its TemporalBinaryV / TemporalBinaryV1 / TemporalBinaryTT helpers). Merge order: #27 → this.

[estebanzimanyi]

Consolidated into #43 (tnumber numeric functions — arithmetic + unary + distance).