Performance improvement for `String#to`

```ruby
class String
  def to1(position)
    position = [position + length, -1].max if position < 0
    self[0, position + 1]
  end

  def to2(position)
    position += size if position < 0
    self[0, position + 1] || +""
  end
end

Benchmark.ips do |x|
  x.report("'foo'.to(1)")  { 'foo'.to(1) }
  x.report("'foo'.to1(1)") { 'foo'.to1(1) }
  x.report("'foo'.to2(1)") { 'foo'.to2(1) }

  x.report("'foo'.to(-1)")  { 'foo'.to(-1) }
  x.report("'foo'.to1(-1)") { 'foo'.to1(-1) }
  x.report("'foo'.to2(-1)") { 'foo'.to2(-1) }

  x.report("'foo'.to(-10)")  { 'foo'.to(-10) }
  x.report("'foo'.to1(-10)") { 'foo'.to1(-10) }
  x.report("'foo'.to2(-10)") { 'foo'.to2(-10) }
end
```

Result:

```
Warming up --------------------------------------
         'foo'.to(1)   199.859k i/100ms
        'foo'.to1(1)   220.293k i/100ms
        'foo'.to2(1)   221.522k i/100ms
        'foo'.to(-1)   205.032k i/100ms
       'foo'.to1(-1)   195.837k i/100ms
       'foo'.to2(-1)   214.975k i/100ms
       'foo'.to(-10)   214.331k i/100ms
      'foo'.to1(-10)   182.666k i/100ms
      'foo'.to2(-10)   224.696k i/100ms
Calculating -------------------------------------
         'foo'.to(1)      4.685M (± 4.2%) i/s -     23.583M in   5.042568s
        'foo'.to1(1)      5.233M (± 5.8%) i/s -     26.215M in   5.026778s
        'foo'.to2(1)      5.180M (± 5.7%) i/s -     25.918M in   5.020735s
        'foo'.to(-1)      4.253M (± 7.0%) i/s -     21.323M in   5.043133s
       'foo'.to1(-1)      4.438M (±11.2%) i/s -     21.934M in   5.025751s
       'foo'.to2(-1)      4.716M (± 9.8%) i/s -     23.432M in   5.028088s
       'foo'.to(-10)      4.678M (± 9.5%) i/s -     23.148M in   5.007379s
      'foo'.to1(-10)      4.428M (± 5.1%) i/s -     22.103M in   5.005155s
      'foo'.to2(-10)      5.243M (± 4.6%) i/s -     26.289M in   5.024695s
```

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