Use Db opening modes in integration tests + rename DbMode to DbOpenMode

[ihtefyw]

This PR adapts the integration tests in lib.rs to use different DB opening modes.
Moreover, the term mode was used for both live/archive and opening modes. To clarify them, I renamed the DbMode enum to DbOpenMode and the rstest template db_mode to archive_impl_and_open_mode.

Because the open_carmen_db function is used in the FFI DB opening function, I modify it to open the DB always with read/write permissions. I am not sure if it can be of any use to have a read only option from the Go side, but I opened and linked an issue to keep track of it.

[codecov]

Codecov Report

❌ Patch coverage is 91.45299% with 10 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
rust/src/storage/storage_with_flush_buffer.rs	37.50%	4 Missing and 1 partial ⚠️
rust/src/bin/node_statistics/linear_scan_stats.rs	0.00%	2 Missing ⚠️
rust/src/lib.rs	60.00%	0 Missing and 2 partials ⚠️
...st/src/bin/node_statistics/tree_traversal_stats.rs	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
rust/src/ffi/exported.rs	97.35% <100.00%> (+<0.01%)	⬆️
rust/src/node_manager/cached_node_manager.rs	95.88% <ø> (ø)
rust/src/statistics/storage/mod.rs	96.91% <100.00%> (+1.36%)	⬆️
rust/src/storage/file/file_storage_manager/mod.rs	95.57% <100.00%> (ø)
...storage/file/file_storage_manager/root_ids_file.rs	95.12% <100.00%> (ø)
rust/src/storage/file/from_to_file.rs	90.56% <100.00%> (ø)
rust/src/storage/file/node_file_storage/mod.rs	93.37% <100.00%> (ø)
.../storage/file/node_file_storage/reuse_list_file.rs	97.23% <100.00%> (ø)
rust/src/storage/mod.rs	100.00% <100.00%> (ø)
...st/src/bin/node_statistics/tree_traversal_stats.rs	0.00% <0.00%> (ø)
... and 3 more

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