feat(client): add CLIENT UNBLOCK command

[raashish1601]

Closes #1916.

Adds support for the Redis CLIENT UNBLOCK command in @redis/client.

What changed:

• adds CLIENT_UNBLOCK and clientUnblock
• supports numeric and string client IDs
• supports optional TIMEOUT / ERROR modes via CLIENT_UNBLOCK_MODES
• exports CLIENT_UNBLOCK_MODES from the client package
• adds parse-argument coverage

Validation:

• $env:TS_NODE_PROJECT='./packages/test-utils/tsconfig.json'; .\node_modules\.bin\mocha.cmd --require ts-node/register/transpile-only packages/client/lib/commands/CLIENT_UNBLOCK.spec.ts
• npm run build
• npm run lint:changed

Note: npm ci did not run in this Windows/npm setup because the upstream lockfile is not in sync for optional platform packages; I used npm install --ignore-scripts for local validation and did not commit dependency metadata changes.

---

Note

Low Risk
Low risk: adds a new Redis command wrapper and related exports/tests without changing existing command behavior.

Overview
Adds support for Redis CLIENT UNBLOCK to @redis/client, including new CLIENT_UNBLOCK/clientUnblock command entries and an exported CLIENT_UNBLOCK_MODES enum for TIMEOUT/ERROR.

The command implementation accepts numeric or numeric-string client IDs, conditionally appends the mode argument, and includes a new unit test covering argument parsing and mode handling.

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