CNDB-15483: CNDB-15300: Add SSTableReader#getApproximatePositionsForRanges (#1993)

[michaelsembwever]

https://github.com/riptano/cndb/issues/15483

Port into main-5.0 commit 6383d21

CNDB-15483: CNDB-15300: Add `SSTableReader#getApproximatePositionsForRanges` (#1993)

This PR is in the context of https://github.com/riptano/cndb/pull/15380, and is used by its PR https://github.com/riptano/cndb/pull/15380.

It adds a variant of the `SSTableReader#getPositionsForRanges` method that never read the data file to return its results, but in exchange may return positions that slightly "overshoot" the requested range.

Put another way, the added method
`SSTableReader#getApproximatePositionsForRanges` is such that if you call it on some range `R`, and you read the data within the returned positions, then the read data may start by one (at most) key (partition really) that sorts strictly before `R`, and may end by one (at most) key that sorts strictly after `R`.

Additionally, the PR switches the reading of the `Statistics.db` component from using `RandomAccessReader` to using `FileInputStreamPlus`. This is essentially equivalent functionality wise (since the component is deserialized sequentially anyway, there is no random reads), but by making it more "clear" that it doesn't do random reads, it allows us to "direct download" this component like other related components on the CNDB side. See the last point of https://github.com/riptano/cndb/pull/15380 for more details.

[github-actions]

Checklist before you submit for review

• This PR adheres to the Definition of Done
• Make sure there is a PR in the CNDB project updating the Converged Cassandra version
• Use NoSpamLogger for log lines that may appear frequently in the logs
• Verify test results on Butler
• Test coverage for new/modified code is > 80%
• Proper code formatting
• Proper title for each commit staring with the project-issue number, like CNDB-1234
• Each commit has a meaningful description
• Each commit is not very long and contains related changes
• Renames, moves and reformatting are in distinct commits
• All new files should contain the DataStax copyright header instead of the Apache License one

[djatnieks]

Ported changes look good - left comment about maybe extraneous change to xml file.

[michaelsembwever]

AggregationQueriesTest and SecondaryIndexManagerTest failures are on main-5.0 too (not related), and the others i cannot reproduce (not related).

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
81.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[cassci-bot]

❌ Build ds-cassandra-pr-gate/PR-2021 rejected by Butler

---

4 regressions found
See build details here

---

Found 4 new test failures

Test	Explanation	Runs	Upstream
o.a.c.cql3.validation.entities.SecondaryIndexTest.testCreateAndDropIndexWithQuotedIdentifier (compression)	REGRESSION	🔴🔵	0 / 11
o.a.c.cql3.validation.operations.AggregationQueriesTest.testAggregationQueryShouldNotTimeoutWhenItExceedesReadTimeout (compression)	REGRESSION	🔴🔴	2 / 11
o.a.c.distributed.test.repair.ForceRepairTest.force ()	NEW	🔴⚪	0 / 11
o.a.c.distributed.test.sai.VectorDistributedTest.testBasicGeoDistance	REGRESSION	🔴🔵	0 / 11

---

Found 7 known test failures