Make partiql_value::parse_ion public

[am357]

Description of changes:

Make partiql_value::parse_ion public.

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

[github-actions]

Conformance comparison report

	Base (7e54311)	b7d76cc	+/-
% Passing	79.27%	79.27%	0.00%
✅ Passing	2229	2229	0
❌ Failing	389	389	0
🔶 Ignored	194	194	0
Total Tests	2812	2812	0

Number passing in both: 2229

Number failing in both: 389

Number passing in Base (7e54311) but now fail: 0

Number failing in Base (7e54311) but now pass: 0

[codecov]

Codecov Report

Base: 87.94% // Head: 87.94% // No change to project coverage 👍

Coverage data is based on head (7c99555) compared to base (7e54311).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #294   +/-   ##
=======================================
  Coverage   87.94%   87.94%           
=======================================
  Files          38       38           
  Lines        9196     9196           
=======================================
  Hits         8087     8087           
  Misses       1109     1109           

Impacted Files	Coverage Δ
partiql-value/src/lib.rs	92.59% <ø> (ø)
partiql-value/src/ion.rs	94.73% <100.00%> (ø)

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