feat: support transaction cursor pagination

[slowbackspace]

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[Copilot]

Pull request overview

This PR adds cursor-based (block range) filtering for transaction-list endpoints while ensuring cursor query parameters are retained during multi-page “fetch all” pagination.

Changes:

• Introduces CursorPagination with from/to (inclusive) cursor builders on Pagination.
• Adds cursor query parameter support to account/address/asset transaction endpoints.
• Updates URL batch generation to preserve non-pagination query parameters (e.g., from/to) across pages and adds unit tests + changelog entry.

Reviewed changes

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

Show a summary per file

File	Description
src/url.rs	Adds cursor-aware URL builder and preserves extra query params in generate_batch (plus tests).
src/pagination.rs	Adds CursorPagination and Pagination::{with_from,with_to,with_range} helpers (plus tests).
src/lib.rs	Re-exports CursorPagination from the crate root.
src/api/mod.rs	Adds internal call_cursor_paged_endpoint and a test ensuring cursor params are sent.
src/api/endpoints/assets.rs	Updates asset transactions endpoint to accept cursor pagination.
src/api/endpoints/addresses.rs	Updates address transactions endpoint to accept cursor pagination.
src/api/endpoints/accounts.rs	Updates account transactions endpoint to accept cursor pagination.
CHANGELOG.md	Documents the added cursor support.

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

CHANGELOG.md:14

• The PR description mentions adding a CursorPagination type, but the implementation (and this changelog entry) extends Pagination with from/to and introduces BlockCursor. Please update the PR description to match the actual API changes (or rename/introduce the described type) to avoid confusion for reviewers and release notes consumers.

### Added

- `Pagination::with_from`, `Pagination::with_to` and `Pagination::with_range` for inclusive `from`/`to`
  block cursors, plus the `BlockCursor` type they take
- Cursors are only sent by the three endpoints that accept them (`accounts_transactions`,