"<>" inequality operator gives token parsing error

[jkenefick]

Describe the bug
The vNext Azure Cosmos DB Emulator does not support the <> inequality operator

To Reproduce
Steps to reproduce the behavior:

1. Bring up the vNext Azure Cosmos DB Emulator
2. Create new Container (properties are irrelevant)
3. Attempt a query or a filter with a WHERE clause such as where c.id <> "12"
4. Error message observed at bottom of screen is Failed to parse token '>' at position 85
5. Log errors include

DocDBTrace Warning: 0 : Intercepted query parsing error Antlr4.Runtime.NoViableAltException: Exception of type 'Antlr4.Runtime.NoViableAltException' was thrown.
   at Antlr4.Runtime.Atn.ParserATNSimulator.ExecATN(DFA dfa, DFAState s0, ITokenStream input, Int32 startIndex, ParserRuleContext outerContext)
   at Antlr4.Runtime.Atn.ParserATNSimulator.AdaptivePredict(ITokenStream input, Int32 decision, ParserRuleContext outerContext)
   at Microsoft.Azure.Cosmos.Postgres.Core.Query.Antlr.Generated.CosmosQueryParser.scalar_expression(Int32 _p) in /tmp/gateway/Cosmos.Postgres.Core/Query/Parser/Generated/CosmosQueryParser.cs:line 1981

DocDBTrace Warning: 0 : Intercepted query parsing error Antlr4.Runtime.NoViableAltException: Exception of type 'Antlr4.Runtime.NoViableAltException' was thrown.
   at Antlr4.Runtime.Atn.ParserATNSimulator.ExecATN(DFA dfa, DFAState s0, ITokenStream input, Int32 startIndex, ParserRuleContext outerContext)
   at Antlr4.Runtime.Atn.ParserATNSimulator.AdaptivePredict(ITokenStream input, Int32 decision, ParserRuleContext outerContext)
   at Microsoft.Azure.Cosmos.Postgres.Core.Query.Antlr.Generated.CosmosQueryParser.scalar_expression(Int32 _p) in /tmp/gateway/Cosmos.Postgres.Core/Query/Parser/Generated/CosmosQueryParser.cs:line 1968

Expected behavior
The <> operator should work as it does on the Cloud CosmosDB

Screenshots

Desktop (please complete the following information):

• OS: [e.g. MacOS]
• Browser [Chrome]
• Explorer Version 3bf0f09d37fb559466f78c848326b8adfb409ba6
• Docker image information: mcr.microsoft.com/cosmosdb/linux/azure-cosmos-emulator vnext-preview db99cc6bc4aa

Additional context
It's causing a problem because we require it in our TestContainers. Code such as the following is currently incompatible with the vNext emulator and will cause issues with the ChangeFeed feature.

https://github.com/Azure/azure-sdk-for-java/blob/main/sdk/cosmos/azure-cosmos/src/main/java/com/azure/cosmos/implementation/changefeed/pkversion/LeaseStoreManagerImpl.java#L502