Collating sequences

[atdrendel]

• Add SQLiteDatabase.addCollation(named:comparator:) and SQLiteDatabase.removeCollation(named:)
• Update GRDB to new major version 7

[Copilot]

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

Tests/SQLiteTests/SQLiteDatabaseTests.swift:235

• [nitpick] Consider splitting the different collation scenarios into separate test cases to simplify debugging if one scenario fails.

for (toInsert, binarySort, localizedSort) in cases {

Sources/SQLite/SQLiteDatabase.swift:609

• [nitpick] Consider adding a clarifying comment to explain that the comparator function in removeCollation is a dummy value since removal is based solely on the collation's name.

function: { _, _ in .orderedSame }