refactor(utils): inline defaults and isArguments helpers

[PavelPashov]

Fixes #2106

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Note

Medium Risk
Behavior must stay compatible with lodash.defaults/isarguments across connection parsing, option merging, and auto-pipelining; regressions would affect many code paths, though new unit tests reduce that risk.

Overview
Replaces the runtime dependencies lodash.defaults and lodash.isarguments with in-repo implementations under lib/utils/defaults.ts and lib/utils/isArguments.ts (adapted from es-toolkit compat / Lodash-style behavior, with license headers). lib/utils/lodash.ts now re-exports those modules instead of requireing the npm packages, and isArguments is also exported from lib/utils/index.ts.

package.json drops the two lodash packages and their @types/* devDependencies; package-lock.json reflects the slimmer tree. Unit tests in test/unit/utils.ts lock in lodash-like semantics for defaults and isArguments (multi-source merge, null vs undefined, iteratee guard, arguments detection).

Call sites (Redis, parseURL, cluster helpers, auto-pipelining) keep importing from ./utils/lodash—this is primarily a dependency footprint / vendoring change, not a new feature API.

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🎉 This PR is included in version 5.11.0 🎉

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