refactor(core): use exportName transform

[gregberge]

BREAKING CHANGE: @svgr/core now exposes { transform } instead of default export.

[vercel]

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[codecov]

Codecov Report

Merging #616 (152bc8f) into main (00a1d4b) will increase coverage by 89.62%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           main     #616       +/-   ##
=========================================
+ Coverage      0   89.62%   +89.62%     
=========================================
  Files         0       32       +32     
  Lines         0      694      +694     
  Branches      0      221      +221     
=========================================
+ Hits          0      622      +622     
- Misses        0       71       +71     
- Partials      0        1        +1     

Impacted Files	Coverage Δ
packages/cli/src/util.ts	80.00% <100.00%> (ø)
packages/core/src/transform.ts	89.47% <100.00%> (ø)
packages/rollup/src/index.ts	95.23% <100.00%> (ø)
packages/webpack/src/index.ts	96.29% <100.00%> (ø)
.../babel-plugin-transform-svg-component/src/index.ts	100.00% <0.00%> (ø)
...el-plugin-transform-svg-component/src/variables.ts	98.90% <0.00%> (ø)
...ckages/hast-util-to-babel-ast/src/getAttributes.ts	88.57% <0.00%> (ø)
packages/hast-util-to-babel-ast/src/all.ts	100.00% <0.00%> (ø)
packages/hast-util-to-babel-ast/src/one.ts	77.77% <0.00%> (ø)
packages/hast-util-to-babel-ast/src/handlers.ts	79.31% <0.00%> (ø)
... and 26 more

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