Preserve binary members as VectorSetRange bounds

[Laurianti]

VectorSetRange and VectorSetRangeEnumerate build the [/( bounds by string concatenation, ("(" + value). For a member that is not valid UTF-8, RedisValue.ToString() returns its hex form, so the bound sent to the server is not the member. ZRANGEBYLEX already builds its bounds from the raw bytes in GetLexRange; this change makes VRANGE use the same helper.

With members a, b and { 0xFF, 0x01 }, against Redis 8:

• VectorSetRange(key, start: binary, exclude: Exclude.Start) returned the binary member itself instead of nothing.
• VectorSetRangeEnumerate(key, count: 1) never ended: after a, b, 0xFF01 it kept returning 0xFF01, because each next batch started from the hex text, which sorts before the member.

Added VectorSetRange_BinaryMemberAsBound and VectorSetRangeEnumerate_BinaryMembers to VectorSetIntegrationTests. Against Redis 8, --filter VectorSetRange passes 40 of 40 (RESP2 and RESP3); without the change only the two new tests fail, in both protocols. The library builds for all targets with no warnings.

Checklist

• I fully and freely contribute this code in accordance with the project license (and am legally able to do so)
• I take responsibility for this contribution's quality and correctness, including any portions produced with AI assistance (see CONTRIBUTING.md).

[Copilot]

Copilot review overview

🟢 Approval recommended

The shared bound construction fixes the binary corruption issue and is covered by focused regression tests.

Review effort: Balanced
Findings: None

What changed in this PR

Fixes VRANGE bounds to preserve binary members by reusing raw-byte lexicographic bound construction.

Changes:

• Replaces string concatenation with GetLexRange.
• Adds binary-bound and pagination regression tests.

File	Description
src/​StackExchange.Redis/​RedisDatabase.VectorSets.cs	Builds vector range bounds from raw bytes.
tests/​StackExchange.Redis.Tests/​VectorSetIntegrationTests.cs	Tests binary bounds and finite enumeration.

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[Laurianti]

The Windows failure is BacklogTests.TotalOutstandingIncludesBacklogQueue, which also failed on Windows in run 36694984305 (marc/bulk-string-concurrency-ceiling); it is unrelated to VRANGE, and the Ubuntu job that runs the vector set tests passed.