Fix format errors

[morganchen12]

The original errors are here:

Firestore/core/src/api/expressions.h:46:  "virtual" is redundant since function is already declared as "override"  [readability/inheritance] [4]
Firestore/core/src/api/pipeline_result.h:54:  Single-parameter constructors should be marked explicit.  [runtime/explicit] [5]
Firestore/core/src/api/query_snapshot.cc:93:  Add #include <vector> for vector<>  [build/include_what_you_use] [4]
Firestore/core/src/api/query_snapshot.h:69:  Add #include <vector> for vector<>  [build/include_what_you_use] [4]
Firestore/core/src/api/realtime_pipeline_snapshot.h:71:  #endif line should be "#endif  // FIRESTORE_CORE_SRC_API_REALTIME_PIPELINE_SNAPSHOT_H_"  [build/header_guard] [5]
Firestore/core/src/core/view.cc:26:  Include the directory when naming .h files  [build/include_subdir] [4]

I'm unsure how to fix this error:

Error: Directories 'Firestore/Source/Public/FirebaseFirestore/' and 'FirebaseFirestoreInternal/FirebaseFirestore/' differ:
Files only in 'Firestore/Source/Public/FirebaseFirestore/':
- FIRPipelineBridge.h
Files only in 'FirebaseFirestoreInternal/FirebaseFirestore/':

Copying the file over seemed to break a bunch of stuff.

#no-changelog

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[cherylEnkidu]

I can create a PR to fix the error on C++ side. For the objective-C one, I remember @NickChittle mentioned one of the directory is auto-generated. But I don't know how to generate those.

[cherylEnkidu]

Actually, I am going to change on your branch to avoid so much rebase ...

[morganchen12]

Sounds good, feel free to take over the PR