Add InstanceMember flag to DeclarationFlags to enable membervar semantic token modifier for self.member

[Copilot]

self.member instance variables were not receiving the membervar semantic token modifier because the protocol had no way to distinguish instance-level assignments (self.x = value) from class-level declarations (class Foo: x = value).

Protocol changes

• tsp.json (v0.2.0 → v0.3.0): Added InstanceMember = 131072 (1 << 17) to DeclarationFlags; renamed ClassMember → ClassAttribute with corrected documentation (it marks any class attribute — method, class variable, or instance variable — as opposed to a standalone local variable or function)
• typeServerProtocol.ts (v0.4.0 → v0.5.0): Added DeclarationFlags const enum and optional flags?: DeclarationFlags field to RegularDeclaration

export const enum DeclarationFlags {
    ClassAttribute = 1 << 0,  // class attribute (method, class variable, or instance variable)
    // ...
    InstanceMember = 1 << 17, // instance variable assigned via self in a method
}

export interface RegularDeclaration extends DeclarationBase<DeclarationKind.Regular> {
    category: DeclarationCategory;
    flags?: DeclarationFlags;  // new: carries ClassAttribute / InstanceMember etc.
    node: Node;
    name: string | undefined;
}

Test file

Updated semanticToken.py to include both a class-level variable (expected classvar modifier) and a self-assigned instance variable (expected membervar modifier) to make the distinction explicit and testable.

Original prompt

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This section details on the original issue you should resolve

<issue_title>self.member does not show membervar modifier</issue_title>
<issue_description>Description:This issue references #7887.

It points out the following behavior:

• self.member does not show a membervar modifier.

• Only variables explicitly declared using the syntax Class c: member = xx are marked as classvar.

This discrepancy makes it difficult to identify member variables consistently.

Request:Please investigate the behavior and provide clarification or a potential fix.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes self.member does not show membervar modifier #7889

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[heejaechang]

@copilot for now, class member indicates whether symbol is standalone symbol like local variable or function vs class arributes like method, class variable, instance varialbe. It doesnt indicate @classvar

If classmember is confusing, change it to classattributes or something similar

[Copilot]

@copilot for now, class member indicates whether symbol is standalone symbol like local variable or function vs class arributes like method, class variable, instance varialbe. It doesnt indicate @clas...

Renamed ClassMember → ClassAttribute in both tsp.json and typeServerProtocol.ts and updated the documentation to reflect that it marks any class attribute (method, class variable, or instance variable) as opposed to a standalone local variable or function (commit aac803e).