[HttpFoundation] [Session] lazy session start for #6036

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | yes
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #6036
| License       | MIT
| Doc PR        | 

This patch solve problem when session starts after call read method like get, has, count without checking that session isStarted.