tidb-server v8.0.0

For new features, improvements, and bug fixes released in 8.0.0 for tidb-server, see TiDB 8.0.0 release notes.
See the difference from the issue perspective:

- pingcap/tidb#51289

• #51316

• #51254

• #51184

• #47167

• #50043, close #51324

• #50052

• #51376

• #51368

• #51381

• #50614

• #51343

• #50849

• #51078

• #51256

• #51344

• #51372

• #43527

• #51396

• #51326

• #50927

• #51383

• #51408

• #51422

• #51081

• #51427

• #51419

• #50711

• #50872, close #50914

• #50743

• #51313

• #50593

• #51474

• #51409

• (#51496

• #51307

• #51462, close #51481

• #51473

• #51495

• #51456

• #51503

• writer when reader has error (#51509

• #48359

• #51387

• #50665

• #51326

• #51505

• #50772

• #51527

• #51370

• #48257

• #51540

• #51445

• #51556

• #51563

• #51581

• #44609

• #50061

• #51596

• #51557

• #36433, close #49251

• #51516

• #51588

• #50467

• #51477

• #51554, close #51570

• #51587

• #51647

• #51629

• #51649

• #45798

• #51366

• #51572

• #51668

• #33031, close #45532

• #51310, close #51641

• #48295

• #51547

• #51685

• #51684

• #51664

• #51703

• #51717

• #51690

• #51448

• #50803

• #51679

• #47523

• #51699

• #51743

• #51749

• #51673

• #51719

• #51758

• #51501

• #50467

• #51666

• #51786

• #51775

• #46867

• #51746

• #51766

• #51736

• #51768

• #51639

• #51790

• #51675

• #51762, close #51807

• #51634

• #51761, close #51797

• #51686

• #51499

• #51825

• #51560

• #51625

• #51399

• #51778

• #51859

• #51920

• #51936

• #51829

• #51107

• #51910

• #51162

• #51962

• #51972

• #51942

• #52028

• #52004

• tikv/pd#7849, close #51894

• #52001

• #52042

• #51921

• #51784

• #52023

• #52034

• #51621

• #52080

• #52114

• #51873

• #52198