Improve performance to_h method of Aws::Rails::SqsActiveJob::Configuration object

[roharon]

Description of changes:

Improve performance to_h method of Aws::Rails::SqsActiveJob::Configuration object.

When erase @ of instance_variables,
it could be use String#delete instead of String#gsub .

delete is more faster than gsub
You can refer below benchmark.

require 'benchmark/ips'

STRING = "@abcdefg".freeze

def gsub
  STRING.gsub('@', '').to_sym
end

def delete
  STRING.delete('@').to_sym
end

Benchmark.ips do |x|
  x.report('gsub') { gsub }
  x.report('delete') { delete }
  x.compare!
end

the result is

ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x86_64-linux]
Warming up --------------------------------------
                gsub    81.596k i/100ms
              delete   320.575k i/100ms
Calculating -------------------------------------
                gsub      1.230M (±13.2%) i/s -      6.120M in   5.099980s
              delete      3.425M (±12.5%) i/s -     16.990M in   5.067744s

Comparison:
              delete:  3425068.2 i/s
                gsub:  1229521.8 i/s - 2.79x  slower

By submitting this pull request, I confirm that my contribution is made under
the terms of the Apache 2.0 license.

[alextwoods]

Nice - this looks good and thanks for the contribution + performance benchmarking!

[mullermp]

Thanks. This needs a change log entry.

[roharon]

Thanks. This needs a change log entry.

Then, do I need to update CHANGELOG?

[mullermp]

Yes, please update that file to add an issue line so that our automated system can release it.

[roharon]

@mullermp Thanks for your kindly guide. I changed it aaaf9ab

[mullermp]

Thank you for your contribution! We will release this or next week, we have some upcoming operational work.