Pass read only span to SQLite raw to avoid allocation

[joelverhagen]

Addresses #37435

Before

Method	BlobSize	Mean	Error	StdDev	Op/s	Gen0	Gen1	Gen2	Allocated
OversizedByteArray	100000	105.5 us	15.77 us	46.51 us	9,482.18	-	-	-	196.14 KB
OversizedByteArray	1000000	904.8 us	28.31 us	83.03 us	1,105.28	-	-	-	1953.95 KB
OversizedByteArray	10000000	9,847.3 us	144.79 us	128.35 us	101.55	1000.0000	1000.0000	1000.0000	19532.38 KB
OversizedByteArray	100000000	90,330.1 us	1,794.14 us	3,664.96 us	11.07	1000.0000	1000.0000	1000.0000	195313.59 KB

After

Method	BlobSize	Mean	Error	StdDev	Op/s	Allocated
OversizedByteArray	100000	107.5 us	14.21 us	41.89 us	9,300.42	98.46 KB
OversizedByteArray	1000000	797.8 us	39.09 us	114.65 us	1,253.52	977.37 KB
OversizedByteArray	10000000	8,094.1 us	158.51 us	148.27 us	123.55	9766.43 KB
OversizedByteArray	100000000	74,611.9 us	1,428.43 us	1,587.69 us	13.40	97657.05 KB

The test reduces the array size by 1 byte so the allocation is roughly half as expected.

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[Copilot]

Pull request overview

This PR optimizes SQLite blob parameter binding by changing the BindBlob method signature from byte[] to ReadOnlySpan<byte>, reducing memory allocations when large byte arrays are truncated. The benchmark results show approximately 50% reduction in memory allocations.

Key Changes

• Modified BindBlob abstract method to accept ReadOnlySpan<byte> instead of byte[]
• Updated truncation logic to use Slice instead of Array.Copy, eliminating temporary array allocation
• Added comprehensive benchmark tests to verify the optimization

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
SqliteValueBinder.cs	Changed abstract method signature to use ReadOnlySpan<byte>
SqliteResultBinder.cs	Updated implementation to match new signature, added using System
SqliteParameterBinder.cs	Replaced Array.Copy with Slice for efficient truncation
EFCore.Sqlite.Benchmarks.csproj	Added SQLitePCL package reference for benchmarks
BlobBindingTests.cs	New benchmark class to measure allocation improvements

[cincuranet]

@joelverhagen Great contributions. Thanks. Just some final cleanup and this is ready to go.