[move-ide] Fixed auto-completion for unresolved method chains

[awelc]

Description

When method's access chain was incorrect, no auto-completion was generated even for correctly typed prefix of this chain, such as in this example:

    public struct SomeStruct {
        some_field: u64,
    }

    public fun bar(_some_struct: &SomeStruct):u64 {
        42
    }

    public fun foo(some_struct: &mut SomeStruct): u64 {
        some_struct.
        some_struct.bar()
    }

Additionally, this behavior was inconsistent with the auto-completion behavior for a similar chain but ending in a (supposed) field access instead of a method call, where auto-completion for the dot following the first some_struct would be generated:

    public fun foo(some_struct: &mut SomeStruct): u64 {
        some_struct.
        some_struct.some_field
    }

This PR fixes this issue

Test plan

Added a new test. All tests must pass

[vercel]

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[cgswords]

LGTM.