Make TQDM work nicely in log streams

[farizrahman4u]

Test simple progress bar:

from tqdm import tqdm
import time
import wandb

wandb.init(project='test_tqdm')

start_epoch = 0
num_epochs = 10
for epoch in tqdm(range(start_epoch, start_epoch+num_epochs), "epochs"):
    for batch in range(100):
        wandb.log({"epoch": epoch, "batch": batch})
        time.sleep(0.01)

Test nested progress bar:

from tqdm import tqdm
import time
import wandb

wandb.init(project='test_tqdm_nested')

start_epoch = 0
num_epochs = 10
for epoch in tqdm(range(start_epoch, start_epoch+num_epochs), "epochs"):
    for batch in enumerate(tqdm(range(100), f"{epoch}=")):
        wandb.log({"epoch": epoch, "batch": batch})
        time.sleep(0.01)

[coveralls]

Pull Request Test Coverage Report for Build 5b5e1340-1ded-475f-aff5-d3a97611c17c

• 1 of 17 (5.88%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.02%) to 60.497%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
wandb/internal/file_stream.py	1	17	5.88%
<!--	Total:	1	17	5.88%	-->

Totals
Change from base Build 0178a2cb-f1e5-48b9-ab60-0ca298ba7a32:	-0.02%
Covered Lines:	12057
Relevant Lines:	19930

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💛 - Coveralls