feat: make OMEStream.view() public; allow opening after stream.close

[tlambert03]

this exposes what had been a private feature: the arraylike view onto an ongoing stream. This provides a write-backend-abstracted view onto an ongoing (and now also closed) stream. Intended for use by gui/viewers

the main api now is:

with create_stream(...) as stream:
    view = stream.view()

[codspeed-hq]

Merging this PR will degrade performance by 51.83%

❌ 1 (👁 1) regressed benchmark
✅ 18 untouched benchmarks

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
👁	test_bench_append[t5_c2_z3_xy256-tensorstore]	51.3 ms	106.4 ms	-51.83%

---

_{Comparing public-view (18f6165) with main (1ac01ed)}

[codecov]

Codecov Report

❌ Patch coverage is 98.48485% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.46%. Comparing base (1ac01ed) to head (18f6165).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ome_writers/_backends/_yaozarrs.py	95.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #111      +/-   ##
==========================================
+ Coverage   97.37%   97.46%   +0.08%     
==========================================
  Files          21       21              
  Lines        2250     2285      +35     
==========================================
+ Hits         2191     2227      +36     
+ Misses         59       58       -1     

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