Add compatibility test for all features (467 total)

[eerxuan]

First pass (337 total)

Expression operators

• Add compatibility test for arithmetic expression operators (17 total) #9
• Add compatibility test for string expression operators (20 total) #10
• Add compatibility test for array expression operators (16 total) #11
• Add compatiblity test for date expression operators (22 total) #12
• Add compatiblity test for comparison expression operators (7 total) #13
• Add compatibility test for accumulator expression operators (7 total) #14
• Add compatibility test for type expression operators (9 total) #15
• Add compatibility test for set expression operators (6 total) #16
• Add compatibility test for remaining boolean, conditional, object, misc expression operators (14 total) #17
• Add shared expression engine tests (field paths, nesting, invalid paths) #118
• Add test coverage for aggregation system variables #117

Accumulator and projection operators

• Add compatibility test for accumulator operators (11 total) #28
• Add compatibility test for projection operators (3 total) #29

Query operators

• Add compatibility test for query: array, bitwise, logical, and text operators (12 total) #30
• Add compatibility test for query: comparison operators (8 total) #31
• Add compatibility test for query: geospatial operators (11 total) #32
• Add compatibility test for query: element and evaluation operators (7 total) #33

Stage operators

• Add compatibility test for stage operators (31 total) #34
• Add compatibility test for system stage operators (3 total) #35

Update operators

• Add compatibility test for update: array operators (8 total) #36
• Add compatibility test for update: bitwise and modifier operators (5 total) #37
• Add compatibility test for update: field operators (9 total) #38

Core

• Add compatibility test for core: cursors, data types, and aggregation (10 total) #25
• Add compatibility test for core: collections (16 total) #26
• Add compatibility test for core: indexes (14 total) #27
• Add compatibility test for core: query and write (8 total) #39
• Add compatibility test for core: query planning (6 total) #40
• Add compatibility test for core: sessions (5 total) #41

System

• Add compatibility test for system: administration commands (20 total) #42
• Add compatibility test for system: diagnostic commands (19 total) #43
• Add compatibility test for system: replication commands (13 total) #44

Second pass (130 total)

Expression operators

• Add compatiblity test for trigonometry expression operators (15 total) #18
• Add compatibilty test for remaining second pass expression operators (20 total) #19

Accumulator and stage operators

• Add compatibility test for accumulator operators (13 total) #46
• Add compatibility test for stage operators (12 total) #47

Window operators

• Add compatibility test for window: accumulator operators (15 total) #48
• Add compatibility test for window: statistical operators (5 total) #49
• Add compatibility test for window: rank, position, fill, and interpolation operators (8 total) #50

Core

• Add compatibility test for core: indexes and sessions (6 total) #45

System

• Add compatibility test for system: change streams (15 total) #51
• Add compatibility test for system: security users, authentication, and auditing (11 total) #52
• Add compatibility test for system: security role commands (10 total) #53