use description as band name

[vincentsarago]

This is to also match what we do in xarray #807

# before
with Reader("tests/fixtures/cog_tags.tif") as src:
    info = src.info()
    img = src.preview()
    stats = src.statistics()

    print(info.band_descriptions)
    >> [('b1', 'Green')]

    print(img.band_names)
    >> ['b1']

    print(list(stats))
    >> ['b1']

# now
with Reader("tests/fixtures/cog_tags.tif") as src:
    info = src.info()
    img = src.preview()
    stats = src.statistics()

    print(info.band_descriptions)
    >> [('b1', 'Green')]

    print(img.band_names)
    >> ['Green']

    print(list(stats))
    >> ['Green']

[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark 'rio-tiler Benchmarks'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.50.

Benchmark suite	Current: d26d63c	Previous: a7afa55	Ratio
dateline-int32-none	81.05817093625392 iter/sec (stddev: 0.0003640069041421796)	129.02721795604276 iter/sec (stddev: 0.00016375607088560558)	1.59

This comment was automatically generated by workflow using github-action-benchmark.