Add fetch command

[astolcenburg]

Ref: #RDKEAPPRT-689

[Copilot]

Pull request overview

Adds a new bolt fetch CLI command to download bolt packages from a remote “package store” into the local package store, with support for multiple fetch backends (built-in and user plugins) and accompanying documentation.

Changes:

• Introduces bolt fetch command wiring, CLI option parsing, and global config keys for package store settings.
• Implements fetch backends: basic (direct file download) and rdk (session/cookie-based login + download), plus a plugin mechanism.
• Adds user documentation for bolt fetch and updates existing docs/README/help text.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
bolt/src/globalConfig.cjs	Adds parsing for packageStoreURL, packageStoreType, packageStoreUser from ~/.bolt/config.json.
bolt/src/fetch.cjs	New core implementation for fetching, downloading, auth prompting helpers, and plugin loading.
bolt/src/fetch-basic.cjs	New “basic” fetch backend (no auth; static file server).
bolt/src/fetch-rdk.cjs	New “rdk” backend (login + cookie reuse; re-auth on expiry).
bolt/src/bolt.cjs	Registers fetch command and adds help text.
bolt/README.md	Documents bolt fetch usage and adds packageStoreURL to global config docs.
bolt/docs/local-package-store.md	Notes local package store is used by bolt fetch.
bolt/docs/fetch.md	New detailed documentation for bolt fetch and custom fetch plugins.

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[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

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[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 7 comments.

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[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 7 comments.

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[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

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