Rename DatePrecision to DateTimePrecision

[guilload]

@PSeitz, as discussed on Discord.

[codecov-commenter]

Codecov Report

Merging #2051 (92336e1) into main (04562c0) will decrease coverage by 0.01%.
The diff coverage is 93.33%.

❗ Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

@@            Coverage Diff             @@
##             main    #2051      +/-   ##
==========================================
- Coverage   94.43%   94.43%   -0.01%     
==========================================
  Files         319      319              
  Lines       59639    59639              
==========================================
- Hits        56322    56318       -4     
- Misses       3317     3321       +4     

Impacted Files	Coverage Δ
common/src/lib.rs	91.83% <ø> (ø)
src/lib.rs	98.94% <ø> (ø)
src/schema/mod.rs	100.00% <ø> (ø)
common/src/datetime.rs	66.66% <80.00%> (ø)
src/fastfield/mod.rs	100.00% <100.00%> (ø)
src/fastfield/writer.rs	95.30% <100.00%> (ø)
src/schema/date_time_options.rs	95.45% <100.00%> (ø)
src/schema/schema.rs	98.92% <100.00%> (ø)

... and 6 files with indirect coverage changes

[PSeitz]

LGTM, we don't need the backwards compatibility since it's a breaking change anyway

[guilload]

Just wanted to be gentle on the tantivy users. Do you want me to remove the deprecation stuff? Otherwise, I'll submit a clean-up after PR in one release or two.

[PSeitz]

Okay then let's keep it to getting used to it