Add IM\Message service for im.message.* support

[mesilov]

Q	A
Bug fix?	no
New feature?	yes
Deprecations?	no
Issues	Fix #426
License	MIT

Summary

Implements a new service Bitrix24\SDK\Services\IM\Message\Service\Message
wrapping six im.message.* REST API methods under the im scope:

Method	REST endpoint	Result
add	im.message.add	AddedItemResult
update	im.message.update	UpdatedItemResult
delete	im.message.delete	DeletedItemResult
like	im.message.like (with LikeAction enum: auto/plus/minus)	UpdatedItemResult
share	im.message.share (with ShareType enum: CHAT/TASK/POST/CALEND)	UpdatedItemResult
command	im.message.command	UpdatedItemResult

The service is exposed via a new cached accessor IMServiceBuilder::message().
Two typed backed-string enums (LikeAction, ShareType) sit next to the service
so IDE autocomplete and static analysis can enforce valid values at call sites.

Usage

use Bitrix24\SDK\Services\IM\Message\Service\LikeAction;
use Bitrix24\SDK\Services\IM\Message\Service\ShareType;

\$messages = \$b24->getIMScope()->message();

// send a message and get its ID
\$messageId = \$messages->add('chat2941', 'Hello')->getId();

// edit it
\$messages->update(\$messageId, 'Hello (edited)')->isSuccess();

// toggle a Like
\$messages->like(\$messageId, LikeAction::plus)->isSuccess();

// create a task from a message
\$messages->share(\$messageId, 'chat2941', ShareType::task)->isSuccess();

// delete the message
\$messages->delete(\$messageId)->isSuccess();

Test plan

• `make lint-cs-fixer` — passed
• `make lint-rector` — passed
• `make lint-phpstan` — passed
• `make lint-deptrac` — passed (0 violations)
• `make test-unit` — 770 tests, 1987 assertions, all green
• `make test-integration-im-message` — 4 passed (add/update/delete/like); `testCommand` and `testShare` marked skipped (require chat-bot/chat fixtures not available in the default webhook)

Closes #426

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