zapslog: Drop HandlerOptions.New, use NewHandler

[abhinav]

The pattern of constructors for zapslog.Handler was previously:

type HandlerOptions struct{ ... }

func (*HandlerOptions) New(zapcore.Core) *Handler
func NewHandler(zapcore.Core) *Handler

This was modeled after similar constructors in slog for JSON and Text
handlers.

slog has since dropped those constructors in favor of simple:

func NewJSONHandler(io.Writer, *HandlerOptions) *JSONHandler
func NewTextHandler(io.Writer, *HandlerOptions) *TextHandler

This change similarly drops the options.New method and default
no-argument constructor in favor of:

func NewHandler(zapcore.Core, *HandlerOptions) *Handler

As with slog's JSON or Text handlers, the first argument is the
destination: an io.Writer for JSON and Text, a Zap core for us.

Refs golang/go#59339

[abhinav]

[2023-08-03T15:39:04.953Z] ['error'] There was an error running the uploader: Error uploading to [https://codecov.io:](https://codecov.io/) Error: There was an error fetching the storage URL during POST: 404 - {'detail': ErrorDetail(string='Unable to locate build via Github Actions API. Please upload with the Codecov repository upload token to resolve issue.', code='not_found')}

codecov upload seems to be having trouble

[codecov]

Codecov Report

Merging #1315 (97ce357) into master (7d42ce9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1315   +/-   ##
=======================================
  Coverage   97.93%   97.93%           
=======================================
  Files          50       50           
  Lines        3249     3249           
=======================================
  Hits         3182     3182           
  Misses         57       57           
  Partials       10       10           

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