brunsli: add run_tests.sh

[vitaliset]

Adds run_tests.sh to the brunsli project.

run_tests.sh is used as part of Chronos with cached builds: https://github.com/google/oss-fuzz/tree/master/infra/experimental/chronos#check-tests

Last few lines of output of ./infra/experimental/chronos/check_tests.sh brunsli c++:

Running tests...
Test project /src/brunsli
      Start  1: BitReader.ReadOneByte
 1/29 Test  #1: BitReader.ReadOneByte ..............................   Passed    0.03 sec
      Start  2: BitReader.CheckPadding
 2/29 Test  #2: BitReader.CheckPadding .............................   Passed    0.02 sec
      Start  3: BuildHuffmanTable.Max2048
 3/29 Test  #3: BuildHuffmanTable.Max2048 ..........................   Passed    0.04 sec
      Start  4: BuildHuffmanTable.Max2560
 4/29 Test  #4: BuildHuffmanTable.Max2560 ..........................   Passed    0.02 sec
      Start  5: BuildHuffmanTable.Max272
 5/29 Test  #5: BuildHuffmanTable.Max272 ...........................   Passed    0.02 sec
      Start  6: CApiTest.Roundtrip
 6/29 Test  #6: CApiTest.Roundtrip .................................   Passed    0.04 sec
      Start  7: ContextTest.GoldenACPredictContext
 7/29 Test  #7: ContextTest.GoldenACPredictContext .................   Passed    0.03 sec
      Start  8: Distributions.Worst
 8/29 Test  #8: Distributions.Worst ................................   Passed    0.04 sec
      Start  9: Distributions.Perfect
 9/29 Test  #9: Distributions.Perfect ..............................   Passed    0.19 sec
      Start 10: Distributions.Bad
10/29 Test #10: Distributions.Bad ..................................   Passed    0.03 sec
      Start 11: Distributions.Good
11/29 Test #11: Distributions.Good .................................   Passed    0.02 sec
      Start 12: Distributions.TowardsZero
12/29 Test #12: Distributions.TowardsZero ..........................   Passed    0.02 sec
      Start 13: Distributions.TowardsOne
13/29 Test #13: Distributions.TowardsOne ...........................   Passed    0.02 sec
      Start 14: Distributions.Extremes
14/29 Test #14: Distributions.Extremes .............................   Passed    0.03 sec
      Start 15: DecodeTest.TestFallback
15/29 Test #15: DecodeTest.TestFallback ............................   Passed    0.03 sec
      Start 16: DecodeTest.TestHeaderless
16/29 Test #16: DecodeTest.TestHeaderless ..........................   Passed    0.04 sec
      Start 17: HuffmanTree.Simple
17/29 Test #17: HuffmanTree.Simple .................................   Passed    0.04 sec
      Start 18: HuffmanTree.Limited
18/29 Test #18: HuffmanTree.Limited ................................   Passed    0.02 sec
      Start 19: HuffmanTree.SimpleLiteral
19/29 Test #19: HuffmanTree.SimpleLiteral ..........................   Passed    0.02 sec
      Start 20: HuffmanTree.StableBitDepth
20/29 Test #20: HuffmanTree.StableBitDepth .........................   Passed    0.02 sec
      Start 21: HuffmanTree.ConvertBitDepthsToSymbols
21/29 Test #21: HuffmanTree.ConvertBitDepthsToSymbols ..............   Passed    0.02 sec
      Start 22: HuffmanTree.ConvertBitDepthsToSymbols2
22/29 Test #22: HuffmanTree.ConvertBitDepthsToSymbols2 .............   Passed    0.03 sec
      Start 23: HuffmanTree.WriteHuffmanTree
23/29 Test #23: HuffmanTree.WriteHuffmanTree .......................   Passed    0.04 sec
      Start 24: HuffmanTree.WriteHuffmanTreeSparse
24/29 Test #24: HuffmanTree.WriteHuffmanTreeSparse .................   Passed    0.02 sec
      Start 25: HuffmanTree.WriteHuffmanTreeManyZeros
25/29 Test #25: HuffmanTree.WriteHuffmanTreeManyZeros ..............   Passed    0.02 sec
      Start 26: HuffmanTree.WriteHuffmanTreeShortStipeOfNonZeros
26/29 Test #26: HuffmanTree.WriteHuffmanTreeShortStipeOfNonZeros ...   Passed    0.02 sec
      Start 27: HuffmanTree.WriteHuffmanTreeManyNonZeros
27/29 Test #27: HuffmanTree.WriteHuffmanTreeManyNonZeros ...........   Passed    0.02 sec
      Start 28: LehmerCodeTest.TestPermutation
28/29 Test #28: LehmerCodeTest.TestPermutation .....................   Passed    0.04 sec
      Start 29: QuantMatrixTest.TestFindQ
29/29 Test #29: QuantMatrixTest.TestFindQ ..........................   Passed    0.04 sec

100% tests passed, 0 tests failed out of 29

Total Test time (real) =   0.99 sec

[vitaliset]

Ops, duplicated with #13617.

[github-actions]

vitaliset is a new contributor to projects/brunsli. The PR must be approved by known contributors before it can be merged. The past contributors are: maflcko, DonggeLiu, eustas, inferno-chromium