Log free space and history sizes when opening file

[jedelbo]

What, How & Why?

☑️ ToDos

• 📝 Changelog update
• 🚦 Tests (or not relevant)
• C-API, if public C++ API changed.

[coveralls-official]

Pull Request Test Coverage Report for Build github_pull_request_281728

• 45 of 45 (100.0%) changed or added relevant lines in 5 files are covered.
• 62 unchanged lines in 13 files lost coverage.
• Overall coverage increased (+0.009%) to 90.542%

---

Files with Coverage Reduction	New Missed Lines	%
src/realm/list.cpp	2	88.11%
src/realm/table_view.cpp	2	94.18%
src/realm/uuid.cpp	2	97.06%
test/test_lang_bind_helper.cpp	2	94.23%
src/realm/query_expression.cpp	3	87.59%
src/realm/sync/network/network.cpp	3	89.46%
src/realm/sync/noinst/server/server.cpp	3	76.36%
src/realm/table.cpp	3	90.49%
src/realm/util/serializer.cpp	3	90.03%
test/test_thread.cpp	3	66.67%

Totals
Change from base Build github_pull_request_281710:	0.009%
Covered Lines:	233546
Relevant Lines:	257943

---

💛 - Coveralls

[finnschiermer]

LGTM