Automatically call InitAsync() in BulkCopy

[alex-clickhouse]

• Automatically initialize BulkCopy, making sure it's initialized just once. Users no longer need to call InitAsync() before using BulkCopy.
• Mark InitAsync() obsolete.
• Update the rest of the project accordingly.

---

Note

Auto-initialized BulkCopy

• ClickHouseBulkCopy now initializes automatically on first WriteToServerAsync via EnsureInitializedAsync with a SemaphoreSlim to prevent concurrent double-init
• InitAsync() marked [Obsolete] and now delegates to the new initialization path; Dispose cleans up the semaphore
• Updated error handling/messages and debug logging around metadata load and bulk operations

Project-wide updates

• Removed explicit InitAsync() calls in benchmarks, tests, and examples; added tests for auto-init and concurrent writes
• Adjusted logging tests to validate metadata loading logs during WriteToServerAsync
• Public API updated to reflect obsolete InitAsync; release notes updated

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[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
ClickHouse.Driver/Copy/ClickHouseBulkCopy.cs	87.50%	1 Missing and 1 partial ⚠️

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[Copilot]

Pull request overview

This PR automates the initialization of ClickHouseBulkCopy by calling InitAsync() internally before the first write operation, eliminating the need for users to manually call it. The InitAsync() method is marked as obsolete and will be removed in a future version.

Changes:

• Automatic initialization in ClickHouseBulkCopy using thread-safe lazy initialization pattern
• InitAsync() marked as [Obsolete] with appropriate messaging
• Removal of manual InitAsync() calls throughout examples and tests

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
ClickHouse.Driver/Copy/ClickHouseBulkCopy.cs	Implements automatic initialization with thread-safe lazy pattern using SemaphoreSlim
examples/Insert_002_BulkInsert.cs	Removes manual InitAsync() calls from example code
examples/DataTypes_002_DateTimeHandling.cs	Removes manual InitAsync() call from DateTime handling example
RELEASENOTES.md	Documents the breaking change and obsolescence of InitAsync()
ClickHouse.Driver/PublicAPI/PublicAPI.Unshipped.txt	Tracks InitAsync() as obsolete in public API surface
ClickHouse.Driver.Tests/Types/TimezoneHandlingTests.cs	Updates timezone tests to remove manual initialization
ClickHouse.Driver.Tests/Types/JsonTypeTests.cs	Updates JSON type tests to remove manual initialization
ClickHouse.Driver.Tests/Types/DynamicTests.cs	Updates dynamic type tests to remove manual initialization
ClickHouse.Driver.Tests/Logging/ClickHouseBulkCopyLoggingTests.cs	Updates logging tests to reflect auto-initialization, renames test method
ClickHouse.Driver.Tests/BulkCopy/BulkCopyWithDefaultsTests.cs	Removes manual initialization from bulk copy with defaults test
ClickHouse.Driver.Tests/BulkCopy/BulkCopyTests.cs	Removes manual initialization calls, deletes obsolete test, adds new concurrent initialization tests
ClickHouse.Driver.Benchmark/BulkInsertColumn.cs	Updates benchmark setup to remove manual initialization