[wasm] Add split, sqrt kernels.

[annxingyuan]

These kernels are used by certain audio processing models.

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This change is 

[dsmilkov]

Looks great!

Reviewed 8 of 8 files at r1.
Reviewable status: complete! 1 of 1 approvals obtained (waiting on @annxingyuan, @dsmilkov, and @nsthorat)

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tfjs-backend-wasm/src/kernels/Split.ts, line 20 at r1 (raw file):

import {NamedAttrMap, NamedTensorInfoMap, registerKernel, util} from '@tensorflow/tfjs-core';

import {TensorInfo} from '@tensorflow/tfjs-core';

combine TensorInfo with the previous import

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tfjs-core/src/backends/split_shared.ts, line 20 at r1 (raw file):

import {Tensor} from '../tensor';

// TODO(annxingyuan): Use this helper in WASM Split kernel once intermediate

file an issue?

[annxingyuan]

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @nsthorat)

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tfjs-backend-wasm/src/kernels/Split.ts, line 20 at r1 (raw file):

Previously, dsmilkov (Daniel Smilkov) wrote…

combine TensorInfo with the previous import

Done

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tfjs-core/src/backends/split_shared.ts, line 20 at r1 (raw file):

Previously, dsmilkov (Daniel Smilkov) wrote…

file an issue?

Done