(jsii-reflect) TypeMember should be SourceLocatable

[Chriscbr]

Describe the bug

When I use jsii reflect to get an arbitrary member from a class, I expected to be able to access a locationInModule property since every property and method on a class or interface has a source code location. However, the current types report this as an error since cls.allMembers returns TypeMember[], and TypeMember extends Documentable but not SourceLocatable.

const { TypeSystem } = require("./lib");

async function main() {
    const ts = new TypeSystem();
    await ts.load("../jsii-calc");
    for (const cls of ts.classes) {
        for (const member of cls.allMembers) {
            console.log(`${cls.fqn}.${member.name} (${member.locationInModule.filename}:${member.locationInModule.line})`);
        }
    }
}

main();

Expected Behavior

I expected member.locationInModule to not return a type checking error.

Current Behavior

I get a TypeScript error Property 'locationInModule' does not exist on type 'TypeMember'.

Reproduction Steps

See code snippet above

Possible Solution

No response

Additional Information/Context

No response

SDK version used

jsii 1.68.0

Environment details (OS name and version, etc.)

N/A

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