[FRAME] Introduce `force_adjust_total_issuance` (#3001)

Add `Balances::force_adjust_total_issuance` as preparation for fixing
https://github.com/polkadot-fellows/runtimes/issues/147

.
Important changes in `substrate/frame/balances/src/lib.rs`.

TODO:
- [x] Update weights

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Signed-off-by: Oliver Tale-Yazdi <[email protected]>
Co-authored-by: command-bot <>
Co-authored-by: Bastian Köcher <[email protected]>