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config: fix schema:get()/set() changes passed path

This patch makes `schema:get()`, `schema:set()` and `config:get()` not
change the passed path argument when it is a table.

The problem was in the way the walkthrough process is set up during the
`schema:get()` and `schema:set()` method execution. These methods used
`walkthrough_start()` performing a shallow copy of the passed option
table containing the information on the desired path. The value of
the path was modified during the walkthrough itself. The patch makes
the methods perform a shallow copy of the path field. It also fixes
`config:get()` since it's internally uses `schema:get()`.

This is how broken scenario could be reproduced when using
`config:get()`:
```
tarantool> config = require('config')
tarantool> path = {'fiber', 'slice'}
tarantool> config:get(path)
---
- err: 1
  warn: 0.5
...

tarantool> path
---
- []
...
```

Closes #10855

NO_DOC=bugfix

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