Rename crate to beckon

[azeemshaik025]

Rebrands the crate from http-provider-macro to beckon — one consistent name across the crate, macro, and repo.

Changes

• Crate http-provider-macro → beckon, reset to 0.1.0
• Macro api_client! → beckon!; removed the duplicate http_provider! alias
• Fixed the repository URL (was pointing at the old Azeem-0 account) and malformed authors
• Bumped dev-deps: reqwest 0.11 → 0.12, wiremock 0.5 → 0.6
• Added LICENSE-MIT, LICENSE-APACHE, CHANGELOG.md
• Rewrote README.md (badges, beckon! usage)
• Updated examples, tests, and crate-level docs to the new name

Verification

• cargo build — clean
• cargo test — 19/19 pass
• cargo clippy --all-targets -- -D warnings — clean
• cargo doc -D warnings — clean
• cargo publish --dry-run — packages + verifies

Follow-up (manual, post-merge)

• Rename the GitHub repo api-client-macro → beckon
• cargo publish
• cargo yank the old http-provider-macro versions (0.1.0–0.1.4)