feat: queryAll, queryMore, and full-result pagination

[WalrusSoup]

Summary

Adds first-class support for the Salesforce queryAll resource and cursor-based pagination (queryMore), plus a convenience wrapper that transparently fetches an entire result set across all pages.

Salesforce returns query results in batches (up to 2,000 records). To retrieve everything you must follow the nextRecordsUrl cursor returned on each response until done is true. This PR wires that up end to end.

What's new

• executeQueryAll($builder) / executeQueryAllRaw($rawQuery) — run SOQL against the queryAll endpoint, which also returns soft-deleted and archived records.
• queryMore($nextRecordsUrl) — fetch the next batch of records using the nextRecordsUrl from a prior response. Works for both query and queryAll results.
• getAllRecords($builder, $includeDeleted = false) / getAllRecordsRaw($rawQuery, $includeDeleted = false) — follow pagination until Salesforce reports done, returning the complete result set as a single array. Pass $includeDeleted = true to page through the queryAll endpoint.

Implementation notes

• New QueryMore request strips the /services/data/v{XX.X} prefix from nextRecordsUrl before resolving the endpoint, because the Saloon connector base URL already includes it (absolute URLs are not permitted).
• Per the Salesforce docs, a queryAll request returns a nextRecordsUrl containing /query/ (not /queryAll/) — it still serves the remaining results from the original queryAll. QueryMore handles either path transparently.
• Extracted a shared stripAttributes() helper so record-attribute stripping is no longer duplicated between unpackResponseIfNeeded() and the pagination path.
• getAllRecords* reads the raw response so it can see done / nextRecordsUrl; note that enabling recordsOnly() strips this metadata, so manual queryMore pagination requires it to be off.

Salesforce reference

• Query: https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/dome_query.htm
• QueryAll: https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/resources_queryall.htm
• Verified against the docs: endpoint paths, the q parameter, the totalSize / done / nextRecordsUrl / records response shape, the /query/ form of the queryAll cursor, and the 2,000-record batch limit.

Tests

• New tests/QueryMoreTest.php covering: nextRecordsUrl prefix stripping (query, queryAll, and fully-qualified forms using the real doc example value), multi-page pagination, single-page short-circuit, queryAll endpoint routing, and queryMore request resolution.
• Full suite: 95 passed.

Docs

• README gains a "Running SOQL Queries" section documenting executeQuery/executeQueryAll, manual queryMore pagination (with the recordsOnly() caveat), and getAllRecords full-fetch (with a memory note pointing to the Bulk API for very large exports).