[FIX] chunk_view using 16 bit integers

[eseiler]

[...]: warning: conversion from ‘long long unsigned int’ to ‘uint16_t’ {aka ‘short unsigned int’} changes value from ‘10485760’ to ‘0’ [-Woverflow]
   65 |     for (auto && chunked_records : fin | seqan3::views::chunk((1ULL<<20)*10))

The draft says that chunk_size should be of type std::ranges::range_difference_t<rng_t> (it was also in range-v3), i.e., usually signed. This is probably for conversion signed<->unsigned.
It also states that chunk_size must be positive, though.

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Name	Status	Preview	Updated
seqan3	✅ Ready (Inspect)	Visit Preview	Jun 15, 2022 at 2:25PM (UTC)

[codecov]

Codecov Report

Merging #3014 (f64ed67) into master (d0c5249) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3014   +/-   ##
=======================================
  Coverage   98.21%   98.21%           
=======================================
  Files         275      275           
  Lines       12244    12245    +1     
=======================================
+ Hits        12025    12026    +1     
  Misses        219      219           

Impacted Files	Coverage Δ
include/seqan3/utility/views/chunk.hpp	100.00% <100.00%> (ø)

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